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Google
unauthorized_client — Unauthorized client
Client not authorized for grant/resource.
Riposte solution
Check your Google API client configuration. This error indicates the app is not authorized to use the requested grant or scope. Make sure the OAuth client ID is allowed for Gmail API and the user has granted consent. If needed, update the Google Cloud Console settings or request proper consent, then retry the auth via /auth/sessions.
Quick facts
- Provider
- Endpoint / surface
- OAuth 2.0
- Status code
- 400
Why it happens
[Disallowed grant type; Scope not enabled]
How to fix it
[Enable proper grant flow; request valid scopes]