Hello,
I am writing to report a critical and persistent issue that has completely blocked my use of Vertex AI for several months. Despite having the highest possible administrative permissions at every level and performing exhaustive troubleshooting, my project is unable to access any standard Google Publisher Model, consistently resulting in a 404 Not Found error.
Project ID: n8-wp-ai-agent
I have meticulously performed and verified the following setup:
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Complete Project & Organization Ownership: My primary user is the Organization Administrator, Project Owner, and Billing Account Administrator. My original account is also a Project Owner.
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Active Billing: The project is linked to a fully active, administrator-controlled billing account. The account is a Full Account, not a free trial.
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Correct API & Service Configuration: The Vertex AI API is enabled, and the project has been migrated into a proper Organization structure.
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Correct Permissions: The Service Account used by my application has been granted the Editor and Vertex AI Administrator roles.
The Unresolvable Problem:
Despite this complete and correct setup, any API call to a standard publisher model fails. For example, a POST request to the stable alias endpoint:
Returns this definitive error:
404 Not Found: Publisher Model … gemini-1.0-pro was not found or your project does not have access to it.
I have tried every possible model ID (including the latest gemini-1.5-flash versions and preview models) and even a simple GET request to list all models(…/publishers/google/models) fails with the same 404 error.
Conclusion:
This proves beyond any doubt that the issue is not a user-side configuration error. It must be a backend, platform-level issue with my specific project’s or organization’s entitlement, allowlisting status, or some other hidden restriction that I cannot see or control.
I have now spent an extensive amount of time exhausting all possible troubleshooting paths.
Thanks.