diff --git a/.env.example b/.env.example
index 35147fd..f57a036 100644
--- a/.env.example
+++ b/.env.example
@@ -58,6 +58,11 @@ OCIS_ADMIN_PASSWORD=changeme_use_openssl_rand
 # (required to list all drives). See docs/NEXT-STEPS.md.
 OCIS_SVC_USERNAME=svc-platform-api
 OCIS_SVC_PASSWORD=changeme_use_openssl_rand
+# OCIS account UUID of the service user, used to grant it the OCIS admin role at
+# startup (required for libregraph ListAllDrives). Populate after the OCIS
+# bootstrap autoprovisions the account (see docs/NEXT-STEPS.md). Leave empty
+# until then.
+OCIS_ADMIN_USER_ID=
 
 # ────────────────────────────────────────
 # Collabora
diff --git a/apps/portal/pages/admin/index.vue b/apps/portal/pages/admin/index.vue
index 8f8c49c..828d318 100644
--- a/apps/portal/pages/admin/index.vue
+++ b/apps/portal/pages/admin/index.vue
@@ -3,10 +3,11 @@
 // `AdminDashboard`, but the data is real: workspace identity, seats, spend,
 // plan and recent admin events all come from /api/me + /api/tenants/:slug/*.
 //
-// Sections without a real backend source yet (storage usage, mail-flow health,
-// "open issues" like DMARC/failed-login heuristics) were removed rather than
-// faked — they return when their backends (OCIS metrics, Stalwart metrics, a
-// domain-health checker) exist.
+// Storage usage is real now too (OCIS libregraph via /tenants/:slug/storage) —
+// shown as a second capacity bar in the Plan card. Sections still without a
+// backend (mail-flow health, "open issues" like DMARC/failed-login heuristics)
+// stay removed rather than faked until Stalwart metrics / a domain-health
+// checker exist.
 
 import type { IconName } from '~/components/UiIcon.vue'
 import type { AuditEventDoc, TenantUserDoc } from '~/types/workspace'
@@ -30,6 +31,20 @@ const { data: auditRaw } = await useFetch<AuditEventDoc[]>(
   { key: 'admin-dash-audit', default: () => [], immediate: !!slug.value, watch: [slug] },
 )
 
+// Aggregate storage usage (OCIS) — second capacity bar in the Plan card.
+interface StorageSummary {
+  available: boolean
+  usedBytes: number
+  quotaBytes: number
+  freeBytes: number
+}
+const { data: storage } = await useFetch<StorageSummary | null>(
+  () => `/api/tenants/${slug.value}/storage`,
+  { key: 'admin-dash-storage', default: () => null, immediate: !!slug.value, watch: [slug] },
+)
+const storageAvailable = computed(() => storage.value?.available === true)
+const storagePct = computed(() => percent(storage.value?.usedBytes ?? 0, storage.value?.quotaBytes ?? 0))
+
 const seatsUsed = computed(() => (users.value ?? []).filter((u) => u.active !== false).length)
 const seatsAvailable = computed(() => Math.max(0, seatLimit.value - seatsUsed.value))
 const seatPct = computed(() =>
@@ -149,6 +164,7 @@ const prorated = computed(() => Math.round(monthly.value * (daysUntilRenewal.val
           </div>
 
           <div class="progress-block">
+            <div class="bar-label">Seats</div>
             <div class="progress-bar"><span :style="{ width: `${seatPct}%` }" /></div>
             <div class="progress-legend">
               <span>{{ seatsUsed }} active</span>
@@ -156,6 +172,15 @@ const prorated = computed(() => Math.round(monthly.value * (daysUntilRenewal.val
             </div>
           </div>
 
+          <div v-if="storageAvailable" class="progress-block">
+            <div class="bar-label">Storage</div>
+            <div class="progress-bar"><span :style="{ width: `${storagePct}%` }" /></div>
+            <div class="progress-legend">
+              <span>{{ formatBytes(storage!.usedBytes) }} used</span>
+              <span>{{ formatBytes(storage!.freeBytes) }} free</span>
+            </div>
+          </div>
+
           <div class="seats-cta">
             <div class="seats-cta-text">
               Approaching limit? You can add seats in single increments — billed prorated.
@@ -335,6 +360,14 @@ const prorated = computed(() => Math.round(monthly.value * (daysUntilRenewal.val
 
 /* License progress */
 .progress-block { margin-bottom: 16px; }
+.bar-label {
+  font-family: var(--font-mono);
+  font-size: 10px;
+  letter-spacing: 0.06em;
+  text-transform: uppercase;
+  color: var(--text-mute);
+  margin-bottom: 8px;
+}
 .progress-bar {
   height: 8px;
   background: var(--bg);
diff --git a/docs/NEXT-STEPS.md b/docs/NEXT-STEPS.md
index 80a1f6c..79da1c2 100644
--- a/docs/NEXT-STEPS.md
+++ b/docs/NEXT-STEPS.md
@@ -124,10 +124,29 @@ Need a minimal JMAP client that wraps `Domain/set` (create), `Domain/get`
 via the persistent admin's bearer token from the OAuth flow we already use
 for the web UI.
 
-**OCIS (libregraph)** — `POST /graph/v1.0/drives` with body
-`{ "name": "<slug>", "driveType": "project" }`. Needs service-to-service
-auth: either an OIDC client_credentials grant (requires registering a new
-Authentik provider for the worker) or the IDM admin user's bearer token.
+**OCIS (libregraph)** — space *provisioning* is still stubbed:
+`POST /graph/v1.0/drives` with body `{ "name": "<slug>", "driveType":
+"project" }` to create a tenant's project space, then assign it.
+
+**OCIS read auth (done — powers the customer-admin Storage page).** OCIS has
+*no* backend service-account/client-credentials grant and trusts exactly one
+issuer, and basic auth doesn't resolve a user in our external-IdP setup. The
+working mechanism is a **refresh-token bootstrap**:
+
+1. A dedicated Authentik user `svc-platform-api` (with an email — OCIS
+   autoprovision rejects empty emails) logs in **once** against the *ocis*
+   provider (public client `ocis-web`, per-provider issuer `.../o/ocis/` — the
+   one OCIS trusts). Run it headlessly:
+   `docker compose exec platform-api node /app/scripts/bootstrap-ocis.mjs`.
+   The refresh token is persisted in Mongo (`ocis_credentials`).
+2. `OcisClient` mints access tokens with the `refresh_token` grant and persists
+   the rotated token each call (Authentik rotates on every use).
+3. The svc user needs the OCIS **admin** role for `ListAllDrives` — granted via
+   `OCIS_ADMIN_USER_ID=<svc OCIS account UUID>` on the ocis service.
+
+Note: the "global" issuer mode is **not** an option — its issuer is the
+Authentik root, which has no `.well-known/openid-configuration`, so OCIS can't
+validate tokens against it.
 
 ### Authentik API examples (for the eventual user-creation flow)
 
diff --git a/infrastructure/docker-compose/docker-compose.yml b/infrastructure/docker-compose/docker-compose.yml
index 5cc7d02..bed486c 100644
--- a/infrastructure/docker-compose/docker-compose.yml
+++ b/infrastructure/docker-compose/docker-compose.yml
@@ -325,7 +325,12 @@ services:
       PROXY_AUTOPROVISION_ACCOUNTS: "true"
       PROXY_USER_OIDC_CLAIM: preferred_username
       PROXY_USER_CS3_CLAIM: username
-      OCIS_ADMIN_USER_ID: ""
+      # Grant the OCIS admin role to the platform-api service user (autoprovisioned
+      # OCIS account of svc-platform-api). Admin is required for libregraph
+      # ListAllDrives, which powers the customer-admin Storage page. The UUID is
+      # the svc user's OCIS account id; stable as long as the OCIS data volume
+      # persists. Empty in fresh setups until the OCIS bootstrap has run.
+      OCIS_ADMIN_USER_ID: ${OCIS_ADMIN_USER_ID:-}
       IDM_CREATE_DEMO_USERS: "false"
       IDM_ADMIN_PASSWORD: ${OCIS_ADMIN_PASSWORD}
       STORAGE_USERS_DRIVER: ocis  # Local filesystem in dev
diff --git a/services/platform-api/scripts/bootstrap-ocis.mjs b/services/platform-api/scripts/bootstrap-ocis.mjs
new file mode 100644
index 0000000..cd72824
--- /dev/null
+++ b/services/platform-api/scripts/bootstrap-ocis.mjs
@@ -0,0 +1,145 @@
+// One-time bootstrap: headless OIDC login of the OCIS service user against the
+// ocis provider (public client `ocis-web`) to obtain a refresh token, then
+// persist it into Mongo (ocis_credentials). The running platform-api then mints
+// access tokens with the refresh_token grant (see OcisClient). Re-run this if
+// the refresh token is ever revoked/expired.
+//
+// Run inside the platform-api container (it has the mkcert CA + Mongo access):
+//   docker compose exec platform-api node /app/scripts/bootstrap-ocis.mjs
+// Requires env: AUTHENTIK_API_URL, OCIS_SVC_USERNAME, OCIS_SVC_PASSWORD, MONGODB_URI.
+import crypto from 'node:crypto'
+import mongoose from 'mongoose'
+
+const API = process.env.AUTHENTIK_API_URL // https://auth.dezky.local/api/v3
+const ROOT = API.replace('/api/v3', '')
+const USER = process.env.OCIS_SVC_USERNAME
+const PASS = process.env.OCIS_SVC_PASSWORD
+const CLIENT_ID = 'ocis-web'
+const REDIRECT = 'https://files.dezky.local/oidc-callback'
+const SCOPE = 'openid profile email offline_access'
+
+const b64url = (b) => b.toString('base64').replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '')
+const verifier = b64url(crypto.randomBytes(32))
+const challenge = b64url(crypto.createHash('sha256').update(verifier).digest())
+const state = b64url(crypto.randomBytes(8))
+
+// --- tiny cookie jar ---
+const jar = new Map()
+function store(res) {
+  for (const c of res.headers.getSetCookie?.() ?? []) {
+    const [pair] = c.split(';')
+    const i = pair.indexOf('=')
+    jar.set(pair.slice(0, i).trim(), pair.slice(i + 1).trim())
+  }
+}
+const cookieHeader = () => [...jar.entries()].map(([k, v]) => `${k}=${v}`).join('; ')
+const csrf = () => jar.get('authentik_csrf')
+
+async function main() {
+  const authzQuery = new URLSearchParams({
+    response_type: 'code',
+    client_id: CLIENT_ID,
+    redirect_uri: REDIRECT,
+    scope: SCOPE,
+    state,
+    code_challenge: challenge,
+    code_challenge_method: 'S256',
+  }).toString()
+
+  // 1) Hit authorize → 302 into the authentication flow; capture session cookies
+  //    AND the flow's `next` query (so the executor resumes THIS authorize plan,
+  //    not the brand's default landing app).
+  let res = await fetch(`${ROOT}/application/o/authorize/?${authzQuery}`, { redirect: 'manual' })
+  store(res)
+  const loc1 = res.headers.get('location') || ''
+  console.log('authorize ->', res.status, loc1.slice(0, 80))
+  // The executor takes the flow URL's whole querystring wrapped in a single
+  // `query` param — that's how `next` (the authorize continuation) is carried.
+  const flowQuery = loc1.includes('?') ? loc1.slice(loc1.indexOf('?') + 1) : `next=${encodeURIComponent('/application/o/authorize/?' + authzQuery)}`
+
+  // 2) Run the authentication flow via the executor API (identification → password).
+  const exec = `${ROOT}/api/v3/flows/executor/default-authentication-flow/?query=${encodeURIComponent(flowQuery)}`
+  const hdr = () => ({
+    'Content-Type': 'application/json',
+    Accept: 'application/json',
+    Cookie: cookieHeader(),
+    'X-Authentik-CSRF': csrf() ?? '',
+    Referer: `${ROOT}/`,
+  })
+
+  // Unified flow driver: Authentik mixes JSON stages (POST answers) with
+  // HTTP redirects (xak-flow-redirect / 302). Loop until we land on the
+  // redirect_uri with a ?code=.
+  const abs = (u) => (u.startsWith('http') ? u : ROOT + u)
+  let url = exec
+  let method = 'GET'
+  let body = null
+  let code
+  for (let i = 0; i < 14 && !code; i++) {
+    res = await fetch(url, { method, headers: hdr(), body, redirect: 'manual' })
+    store(res)
+    if (res.status >= 300 && res.status < 400) {
+      const loc = res.headers.get('location') || ''
+      console.log('  redirect ->', loc.slice(0, 80))
+      if (loc.startsWith(REDIRECT)) { code = new URL(loc).searchParams.get('code'); break }
+      url = abs(loc); method = 'GET'; body = null
+      continue
+    }
+    const stage = await res.json().catch(() => ({}))
+    console.log('  stage:', stage.component, stage.response_errors ? JSON.stringify(stage.response_errors).slice(0, 120) : '')
+    switch (stage.component) {
+      case 'ak-stage-identification': {
+        const payload = { uid_field: USER }
+        if (stage.password_fields) payload.password = PASS
+        method = 'POST'; body = JSON.stringify(payload); url = exec; break
+      }
+      case 'ak-stage-password':
+        method = 'POST'; body = JSON.stringify({ password: PASS }); url = exec; break
+      case 'xak-flow-redirect': {
+        const to = stage.to || ''
+        if (to.startsWith(REDIRECT)) { code = new URL(to).searchParams.get('code'); break }
+        url = abs(to); method = 'GET'; body = null; break
+      }
+      default:
+        throw new Error('unexpected stage: ' + JSON.stringify(stage).slice(0, 300))
+    }
+  }
+  if (!code) throw new Error('no authorization code captured')
+  console.log('CODE captured')
+
+  // 4) Exchange code → tokens.
+  const tokenBody = new URLSearchParams({
+    grant_type: 'authorization_code',
+    code,
+    redirect_uri: REDIRECT,
+    client_id: CLIENT_ID,
+    code_verifier: verifier,
+  })
+  res = await fetch(`${ROOT}/application/o/token/`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/x-www-form-urlencoded', Accept: 'application/json' },
+    body: tokenBody,
+  })
+  const tok = await res.json()
+  console.log('token ->', res.status, tok.error || `refresh_token:${tok.refresh_token ? 'yes' : 'no'} scope:${tok.scope}`)
+  if (!tok.refresh_token) throw new Error('no refresh_token: ' + JSON.stringify(tok).slice(0, 200))
+
+  // Sanity: decode access token issuer + identity.
+  const claims = JSON.parse(Buffer.from(tok.access_token.split('.')[1], 'base64').toString())
+  console.log('iss:', claims.iss, '| preferred_username:', claims.preferred_username)
+
+  // 5) Persist refresh token.
+  await mongoose.connect(process.env.MONGODB_URI)
+  await mongoose.connection.collection('ocis_credentials').updateOne(
+    { key: 'ocis-svc' },
+    { $set: { key: 'ocis-svc', refreshToken: tok.refresh_token, updatedAt: new Date() }, $setOnInsert: { createdAt: new Date() } },
+    { upsert: true },
+  )
+  await mongoose.disconnect()
+  console.log('PERSISTED refresh token to ocis_credentials')
+}
+
+main().catch((e) => {
+  console.log('BOOTSTRAP ERROR:', String(e).slice(0, 400))
+  process.exit(1)
+})
diff --git a/services/platform-api/src/integrations/integrations.module.ts b/services/platform-api/src/integrations/integrations.module.ts
index d76eba2..0f8380e 100644
--- a/services/platform-api/src/integrations/integrations.module.ts
+++ b/services/platform-api/src/integrations/integrations.module.ts
@@ -1,10 +1,16 @@
 import { Module } from '@nestjs/common'
+import { MongooseModule } from '@nestjs/mongoose'
+import { OcisCredential, OcisCredentialSchema } from '../schemas/ocis-credential.schema.js'
 import { AuthentikClient } from './authentik.client.js'
 import { OcisClient } from './ocis.client.js'
 import { StalwartClient } from './stalwart.client.js'
 import { StripeClient } from './stripe.client.js'
 
 @Module({
+  imports: [
+    // OcisClient persists the rotating OCIS service refresh token here.
+    MongooseModule.forFeature([{ name: OcisCredential.name, schema: OcisCredentialSchema }]),
+  ],
   providers: [AuthentikClient, StalwartClient, OcisClient, StripeClient],
   exports: [AuthentikClient, StalwartClient, OcisClient, StripeClient],
 })
diff --git a/services/platform-api/src/integrations/ocis.client.ts b/services/platform-api/src/integrations/ocis.client.ts
index a31e550..9f8655e 100644
--- a/services/platform-api/src/integrations/ocis.client.ts
+++ b/services/platform-api/src/integrations/ocis.client.ts
@@ -1,5 +1,8 @@
 import { Injectable, Logger } from '@nestjs/common'
 import { ConfigService } from '@nestjs/config'
+import { InjectModel } from '@nestjs/mongoose'
+import { Model } from 'mongoose'
+import { OcisCredential, OcisCredentialDocument } from '../schemas/ocis-credential.schema.js'
 
 // A libregraph quota object as returned on each drive. All byte counts are
 // integers; `total` of 0 means "unlimited" in OCIS (the default in dev).
@@ -27,69 +30,94 @@ export interface OcisUser {
   mail?: string
 }
 
-// OCIS integration. Provisioning (ensureSpace/deleteSpace) is still stubbed —
-// it needs the project-space create call (see docs/NEXT-STEPS.md). The READ
-// layer below is real: it lists per-drive quota for the customer-admin Storage
-// page via the libregraph /graph/v1.0 API.
+const CREDENTIAL_KEY = 'ocis-svc'
+
+// OCIS integration. Provisioning (ensureSpace/deleteSpace) is still stubbed.
+// The READ layer is real: it lists per-drive quota for the customer-admin
+// Storage page via the libregraph /graph/v1.0 API.
 //
-// Auth: OCIS has no built-in service-account/client-credentials grant for
-// backend access (ownCloud devs: "one needs to go through OIDC authentication
-// to obtain an access token"), and it trusts exactly one issuer. So we run an
-// OIDC Resource-Owner-Password grant against the SAME Authentik provider OCIS
-// trusts (client `ocis-web`), as a dedicated service user that holds the OCIS
-// admin role (required to list all drives). The short-lived token is cached and
-// refreshed in memory. Basic auth (PROXY_ENABLE_BASIC_AUTH) doesn't resolve the
-// IDM admin in our external-IdP setup, hence this route.
+// Auth is the hard part. OCIS has no backend service-account/client-credentials
+// grant and trusts exactly one issuer; basic auth doesn't resolve a user in our
+// external-IdP setup. The only mechanism that works without reconfiguring SSO is
+// a refresh-token bootstrap: a one-time interactive OIDC login of the service
+// user (svc-platform-api) against the SAME provider OCIS trusts (`ocis-web`,
+// per-provider issuer .../o/ocis/) yields a refresh token. We persist it and
+// mint access tokens with the refresh_token grant from then on. Authentik
+// rotates the refresh token on every use, so we persist the new one each time.
+// The service user must hold the OCIS admin role (required to list all drives).
 @Injectable()
 export class OcisClient {
   private readonly logger = new Logger(OcisClient.name)
   private readonly base: string
   private readonly tokenUrl?: string
   private readonly clientId?: string
-  private readonly clientSecret?: string
-  private readonly username?: string
-  private readonly password?: string
   private readonly scope: string
 
-  // In-memory token cache. Tokens live minutes; we re-grant when within the
-  // skew window. Never persisted — same lifecycle as the process.
-  private token?: string
-  private tokenExpiresAt = 0
+  // In-memory access-token cache (tokens live minutes). The refresh token lives
+  // in Mongo because it rotates and must survive restarts.
+  private accessToken?: string
+  private accessExpiresAt = 0
+  // Single-flight guard so concurrent storage requests don't race the rotating
+  // refresh token (each refresh invalidates the previous one).
+  private refreshing?: Promise<string>
 
-  constructor(config: ConfigService) {
+  constructor(
+    config: ConfigService,
+    @InjectModel(OcisCredential.name) private readonly credModel: Model<OcisCredentialDocument>,
+  ) {
     this.base = config.getOrThrow<string>('OCIS_API_URL')
     this.tokenUrl = config.get<string>('OCIS_OIDC_TOKEN_URL') || undefined
     this.clientId = config.get<string>('OCIS_OIDC_CLIENT_ID') || undefined
-    this.clientSecret = config.get<string>('OCIS_OIDC_CLIENT_SECRET') || undefined
-    this.username = config.get<string>('OCIS_SVC_USERNAME') || undefined
-    this.password = config.get<string>('OCIS_SVC_PASSWORD') || undefined
-    this.scope = config.get<string>('OCIS_OIDC_SCOPE') || 'openid profile email'
+    // offline_access is what makes Authentik issue a refresh token on bootstrap.
+    this.scope = config.get<string>('OCIS_OIDC_SCOPE') || 'openid profile email offline_access'
   }
 
-  // True once we have everything needed to mint a token. When false the read
-  // methods short-circuit so the Storage page renders an "unavailable" state
-  // instead of erroring.
+  // Static config present. Whether we actually have a bootstrapped refresh token
+  // is determined per-call (DB lookup) — a missing token surfaces as the page's
+  // "unavailable" state, not a startup failure.
   get configured(): boolean {
-    return !!(this.tokenUrl && this.clientId && this.username && this.password)
+    return !!(this.tokenUrl && this.clientId)
   }
 
-  // ROPC (password) grant against the ocis provider's token endpoint. Cached
-  // until ~30s before expiry. The resulting token's issuer matches
-  // OCIS_OIDC_ISSUER and its preferred_username maps to the service user.
-  private async getToken(): Promise<string> {
-    if (this.token && Date.now() < this.tokenExpiresAt) return this.token
+  // Seed/replace the refresh token (called by the one-time bootstrap).
+  async setRefreshToken(refreshToken: string): Promise<void> {
+    await this.credModel.updateOne(
+      { key: CREDENTIAL_KEY },
+      { $set: { refreshToken } },
+      { upsert: true },
+    )
+    this.accessToken = undefined
+    this.accessExpiresAt = 0
+  }
 
+  private async loadRefreshToken(): Promise<string> {
+    const doc = await this.credModel.findOne({ key: CREDENTIAL_KEY }).lean().exec()
+    if (!doc?.refreshToken) {
+      throw new Error('OCIS service refresh token not bootstrapped — run the OCIS bootstrap')
+    }
+    return doc.refreshToken
+  }
+
+  private async getToken(): Promise<string> {
+    if (this.accessToken && Date.now() < this.accessExpiresAt) return this.accessToken
+    if (this.refreshing) return this.refreshing
+    this.refreshing = this.refreshAccessToken().finally(() => {
+      this.refreshing = undefined
+    })
+    return this.refreshing
+  }
+
+  // Exchange the stored refresh token for a fresh access token, persisting the
+  // rotated refresh token Authentik hands back. Public client (ocis-web) → no
+  // client secret. The resulting token's issuer matches OCIS_OIDC_ISSUER.
+  private async refreshAccessToken(): Promise<string> {
+    const refreshToken = await this.loadRefreshToken()
     const body = new URLSearchParams({
-      grant_type: 'password',
+      grant_type: 'refresh_token',
       client_id: this.clientId!,
-      username: this.username!,
-      password: this.password!,
+      refresh_token: refreshToken,
       scope: this.scope,
     })
-    // Public clients (ocis-web) omit the secret; included only if configured
-    // (e.g. a confidential service provider).
-    if (this.clientSecret) body.set('client_secret', this.clientSecret)
-
     const res = await fetch(this.tokenUrl!, {
       method: 'POST',
       headers: { 'Content-Type': 'application/x-www-form-urlencoded', Accept: 'application/json' },
@@ -97,13 +125,27 @@ export class OcisClient {
     })
     if (!res.ok) {
       const text = await res.text().catch(() => '')
-      throw new Error(`OCIS token grant → ${res.status}: ${text.slice(0, 200)}`)
+      // A revoked/expired refresh token means a human must re-bootstrap.
+      this.logger.warn(
+        `OCIS token refresh → ${res.status}: ${text.slice(0, 160)} — re-bootstrap the OCIS service login if this persists`,
+      )
+      throw new Error(`OCIS token refresh failed (${res.status})`)
     }
-    const json = (await res.json()) as { access_token?: string; expires_in?: number }
-    if (!json.access_token) throw new Error('OCIS token grant returned no access_token')
-    this.token = json.access_token
-    this.tokenExpiresAt = Date.now() + Math.max(0, (json.expires_in ?? 300) - 30) * 1000
-    return this.token
+    const json = (await res.json()) as {
+      access_token?: string
+      expires_in?: number
+      refresh_token?: string
+    }
+    if (!json.access_token) throw new Error('OCIS token refresh returned no access_token')
+    // Persist the rotated refresh token (Authentik rotates on every use).
+    if (json.refresh_token && json.refresh_token !== refreshToken) {
+      await this.credModel
+        .updateOne({ key: CREDENTIAL_KEY }, { $set: { refreshToken: json.refresh_token } })
+        .exec()
+    }
+    this.accessToken = json.access_token
+    this.accessExpiresAt = Date.now() + Math.max(0, (json.expires_in ?? 300) - 30) * 1000
+    return this.accessToken
   }
 
   private async request<T>(path: string): Promise<T> {
@@ -112,11 +154,10 @@ export class OcisClient {
       headers: { Authorization: `Bearer ${token}`, Accept: 'application/json' },
     })
     if (!res.ok) {
-      // A 401 likely means a stale cached token; drop it so the next call
-      // re-grants. (One retry is enough; callers degrade gracefully on error.)
+      // Drop a possibly-stale access token so the next call re-refreshes.
       if (res.status === 401) {
-        this.token = undefined
-        this.tokenExpiresAt = 0
+        this.accessToken = undefined
+        this.accessExpiresAt = 0
       }
       const body = await res.text().catch(() => '')
       throw new Error(`OCIS GET ${path} → ${res.status}: ${body.slice(0, 200)}`)
@@ -145,7 +186,6 @@ export class OcisClient {
   // ── Provisioning (stubbed) ────────────────────────────────────────────────
   // Real implementation needs POST /graph/v1.0/drives { name, driveType:
   // 'project' } to create a space and assign it to the tenant's group / users.
-  // Phase 4 ships the orchestration; this hooks up in a follow-up.
   async ensureSpace(slug: string): Promise<{ id: string }> {
     this.logger.warn(`OCIS space provisioning is stubbed — would create space for "${slug}" at ${this.base}`)
     return { id: `stub-${slug}` }
diff --git a/services/platform-api/src/schemas/ocis-credential.schema.ts b/services/platform-api/src/schemas/ocis-credential.schema.ts
new file mode 100644
index 0000000..3ab5efe
--- /dev/null
+++ b/services/platform-api/src/schemas/ocis-credential.schema.ts
@@ -0,0 +1,22 @@
+import { Prop, Schema, SchemaFactory } from '@nestjs/mongoose'
+import { HydratedDocument } from 'mongoose'
+
+export type OcisCredentialDocument = HydratedDocument<OcisCredential>
+
+// Persisted OIDC refresh token for the OCIS service user (svc-platform-api).
+// OCIS has no backend service-account grant and trusts a single issuer, so we
+// obtain a token via a one-time interactive OIDC login of the service user
+// against the ocis provider, then keep minting access tokens with the
+// refresh_token grant. Authentik ROTATES refresh tokens on every use, so the
+// newest one must be persisted each time — that's the whole reason this lives
+// in Mongo rather than memory/env. Single-row, keyed by `key`.
+@Schema({ collection: 'ocis_credentials', timestamps: true })
+export class OcisCredential {
+  @Prop({ required: true, unique: true, index: true, default: 'ocis-svc' })
+  key!: string
+
+  @Prop({ required: true })
+  refreshToken!: string
+}
+
+export const OcisCredentialSchema = SchemaFactory.createForClass(OcisCredential)