My Gemini API project returns HTTP 403: “Your project has been denied access. Please contact support.”
I reproduced this with both an AI Studio API key and an OAuth access token obtained through my own web-app client. The OAuth authorization and token exchange succeeded, but a direct generateContent request still returned the same denial.
Model: gemini-3.8-flash
Project ID: 290692456310
AI Studio shows no restriction banner.
My birthday has been updated and two-step verification is enabled.
Please identify the access restriction and advise how to restore free-tier access.