Inquiry regarding Gemini API tier downgrade for project

Hi Google Cloud Support Team,

I am opening this case on behalf of our customer. We noticed a potential issue with the Gemini API (Generative Language API / Vertex AI) quota in the project art-ai-4941...

The customer was previously on a paid tier, but it appears the project has recently been downgraded to Tier 1 (Free Tier), which is now restricting their API usage.

Could you please help us investigate the following:

  1. Current Status: Can you confirm the exact current tier/quota level for Gemini in this project?
  2. Root Cause: If it was downgraded, what triggered this action? (e.g., billing failure, quota depletion, or system flag)
  3. Resolution: What specific steps does the customer need to take to restore their original paid tier?

Looking forward to your prompt response. Thank you!

project id:art-ai-494110