diff --git a/ui/src/auth/LoginPage.tsx b/ui/src/auth/LoginPage.tsx
index 18d2cfff..ccaed52f 100644
--- a/ui/src/auth/LoginPage.tsx
+++ b/ui/src/auth/LoginPage.tsx
@@ -14,6 +14,10 @@ interface OidcInfo {
   additionalScopes?: string[];
 }
 
+// Logto org scopes required for role mapping in multi-tenant setups.
+// Always requested, harmless for non-Logto providers (unknown scopes are ignored per OIDC spec).
+const PLATFORM_SCOPES = ['urn:logto:scope:organizations', 'urn:logto:scope:organization_roles'];
+
 const SUBTITLES = [
   "Prove you're not a mirage",
   "Only authorized cameleers beyond this dune",
@@ -76,7 +80,7 @@ export function LoginPage() {
     if (oidc && !forceLocal && !autoRedirected.current) {
       autoRedirected.current = true;
       const redirectUri = `${window.location.origin}${config.basePath}oidc/callback`;
-      const scopes = ['openid', 'email', 'profile', ...(oidc.additionalScopes || [])];
+      const scopes = ['openid', 'email', 'profile', ...PLATFORM_SCOPES, ...(oidc.additionalScopes || [])];
       const params = new URLSearchParams({
         response_type: 'code',
         client_id: oidc.clientId,
@@ -100,7 +104,7 @@ export function LoginPage() {
     if (!oidc) return;
     setOidcLoading(true);
     const redirectUri = `${window.location.origin}${config.basePath}oidc/callback`;
-    const scopes = ['openid', 'email', 'profile', ...(oidc.additionalScopes || [])];
+    const scopes = ['openid', 'email', 'profile', ...PLATFORM_SCOPES, ...(oidc.additionalScopes || [])];
     const params = new URLSearchParams({
       response_type: 'code',
       client_id: oidc.clientId,
diff --git a/ui/src/auth/OidcCallback.tsx b/ui/src/auth/OidcCallback.tsx
index 9cca67bb..b1676002 100644
--- a/ui/src/auth/OidcCallback.tsx
+++ b/ui/src/auth/OidcCallback.tsx
@@ -31,7 +31,8 @@ export function OidcCallback() {
         api.GET('/auth/oidc/config').then(({ data }) => {
           if (data?.authorizationEndpoint && data?.clientId) {
             const redirectUri = `${window.location.origin}${config.basePath}oidc/callback`;
-            const scopes = ['openid', 'email', 'profile', ...(data.additionalScopes || [])];
+            const PLATFORM_SCOPES = ['urn:logto:scope:organizations', 'urn:logto:scope:organization_roles'];
+            const scopes = ['openid', 'email', 'profile', ...PLATFORM_SCOPES, ...(data.additionalScopes || [])];
             const p = new URLSearchParams({
               response_type: 'code',
               client_id: data.clientId,
diff --git a/ui/src/pages/Admin/OidcConfigPage.tsx b/ui/src/pages/Admin/OidcConfigPage.tsx
index c630a787..e871e812 100644
--- a/ui/src/pages/Admin/OidcConfigPage.tsx
+++ b/ui/src/pages/Admin/OidcConfigPage.tsx
@@ -23,6 +23,9 @@ interface OidcFormData {
   additionalScopes: string[];
 }
 
+// Platform-managed scopes — always requested by the auth flow, hidden from the admin UI
+const PLATFORM_SCOPES = new Set(['urn:logto:scope:organizations', 'urn:logto:scope:organization_roles']);
+
 const EMPTY_CONFIG: OidcFormData = {
   enabled: false,
   autoSignup: true,
@@ -61,7 +64,7 @@ export default function OidcConfigPage() {
         userIdClaim: data.userIdClaim ?? 'sub',
         defaultRoles: data.defaultRoles ?? ['VIEWER'],
         audience: (data as any).audience ?? '',
-        additionalScopes: (data as any).additionalScopes ?? [],
+        additionalScopes: ((data as any).additionalScopes ?? []).filter((s: string) => !PLATFORM_SCOPES.has(s)),
       }))
       .catch(() => setForm(EMPTY_CONFIG));
   }, []);