Account only generating AQ. tokens, cannot create standard AIza API keys

Gemini API
1

Hello Google AI Developer Support,

My account is unable to generate standard Gemini API keys (AIza… prefix).
Every key I create in Google AI Studio — including keys in brand-new projects —
is issued as an “AQ.” prefixed token instead.

When I use these AQ. keys to call the Gemini API (e.g. the
generativelanguage.googleapis.com/v1beta/models endpoint with ?key=…),
the request fails with:

“Request had invalid authentication credentials. Expected OAuth 2 access
token, login cookie or other valid authentication credential.”

I believe my account may have been flagged or restricted from generating
standard API keys. I have billing enabled (paid tier) on the project.

Could you please:

  1. Confirm whether my account has been restricted from generating standard
    AIza API keys, and
  2. Help restore the ability to generate standard Gemini API keys so I can
    use the API for my project?

Account email: duykhanh19.hr@gmail.com
Project number: 498046225048

Thank you very much for your help.