403 PERMISSION_DENIED - "Your project has been denied access. Please contact support."

Gemini API
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1

Google Cloud Project ID automation-bridge

Google Cloud Project Number `1027084847..

Workspace / Domain Name vezeme.com

Account Email b.....@vezeme.com

Error Code / Message 403 PERMISSION_DENIED - "Your project has been denied access. Please contact support."

Model Tested gemini-3.5-flash

Description of Use Case

I am building an automated local-to-cloud routing mesh using n8n to send system parameters to the Gemini API for evaluation and critique. I am connecting via an OAuth 2.0 Client ID originating from a local Docker environment.

Troubleshooting Steps Already Taken (Additional Context)

  • The Generative Language API is explicitly enabled in the Google Cloud Console.

  • My account has been granted explicit Owner and Organization Administrator IAM roles for the project.

  • The 403 error persists regardless of whether the x-goog-user-project header is included or stripped from the HTTP request.

  • The OAuth 2.0 credentials and redirect URIs are properly configured and authorize successfully, but the API gateway hard-blocks the final POST request. This appears to be the known Trust & Safety entitlement block affecting newly created Workspace domain projects.

2

Hello @Filip_Krstevski ,

This is very likely caused by an issue which is currently only visible in Google Cloud console. We’re working to move visibility of this into AI Studio. To resolve this:

  • Open the Cloud console & select your project
  • You should see a banner which explains the issue / may allow you to appeal