Account only issues AQ. prefix keys — all return 401 ACCESS_TOKEN_TYPE_UNSUPPORTED, requesting AIza key restoration

Gemini API
1

My Google account can only generate API keys with the new “AQ.” (Auth key) prefix in Google AI Studio. This happens across all my projects, including newly created ones — regenerating never produces a standard “AIza” key.

All of these AQ. keys are rejected by the Generative Language REST API.

Endpoint: POST https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash:generateContent
Credential sent via: x-goog-api-key header
Response: 401 UNAUTHENTICATED — “Request had invalid authentication credentials. Expected OAuth 2 access token…” with reason ACCESS_TOKEN_TYPE_UNSUPPORTED

Project: gen-lang-client-06253992..
Billing: Tier 1 (prepay) — active

I did not have any key leaks or security incidents. Could you please restore the ability to generate standard AIza-format API keys for my account?

2

Hello @haegolmul ,

We are moving away from Traffic keys (Alza) and towards a more secure Authentication Key (AQ). AI Studio will now only generate Authentication Key (AQ) keys. More information on key usage can be found in the Using Gemini API keys documentation.

Please submit any compatibility issues with services / SDKs etc. in this form for our engineering team to review. Thanks!