403 PERMISSION_DENIED on ALL Gemini API calls (not just Veo) — paid billing active

Hello Gemini API team, my project returns 403 PERMISSION_DENIED
(“Your project has been denied access. Please contact support.”)
on every API call, including plain text generation with
gemini-2.5-flash - not just Veo. Paid billing is active and
verified in Cloud Console. Generative Language API shows as
enabled. I have tried generating a fresh API key with the same
result. No prior usage history, no policy violations I’m aware of.

Project ID: rising-minutia-428406-..

Hello @shekhar_arya ,

Getting a 403 API error response and / or seeing “Unavailable” next to your project in AI audio indicates a flag has been placed on your account. To proceed:

  1. If you’re on the free tier with no billing attached, you should consider setting up billing. In most cases this is enough to clear any flag on your account. Please note this will mean you lose your free tier quota. You should also see a banner in AI studio prompting you to set up billing.

  2. If you are on a paid tier, check for banners / error callouts in the AI Studio Projects page & the Billing page. Mostly these flags cause visible banners or other errors on these pages with concrete next steps / appeal links. You can also check the email address associated with your project for information on next steps.