[RECURRING ISSUE] Persistent 404 Error on Vertex AI (Gemini) - New Project, Correct IAM & Auth on Free Trial Account

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Hello Google Cloud Community,

I am experiencing a persistent 404 Not Found error when trying to make a basic API call to Vertex AI for the gemini-1.0-pro model. I believe my account is not being provisioned correctly, and I cannot contact support due to free trial limitations.

Project Affected: gemini-news-app-test

Error Received:

[VertexAI.ClientError]: got status: 404 Not Found. {"error":{"code":404,"message":"Publisher Model (PII Removed by Staff) was not found or your project does not have access to it."}}

Exhaustive Debugging Steps Taken:

  • The Vertex AI API is enabled.

  • The project is linked to an active billing account with free trial credits.

  • I created a brand new project (gemini-news-app-test) to rule out misconfiguration.

  • My user has both Owner, Vertex AI User, and Service Usage Consumer roles in IAM.

  • My local environment is correctly authenticated using gcloud auth application-default login.

  • I have found multiple other users in this forum reporting the exact same issue on new projects, which strongly suggests an account-level backend problem. For example: (Aquí pega el enlace al post que encontraste)

I am unable to file a technical or billing support ticket because my account is on the free trial. This has put me in a dead-end.

Could anyone from Google on this forum please look into why my new project is not being provisioned correctly to access Vertex AI models?

Thank you for your help.