AI Studio returns "Failed to list models: permission denied" on personal Gmail account

Hello,

I am unable to access Google AI Studio with my personal Gmail account.

The error shown is:

“Failed to list models: permission denied. Please try again.”

I also receive:

“Failed to list imported projects: permission denied.”

and:

“Unable to check your Google AI Subscription.”

I have already tested the following:

  • Personal Gmail account
  • I am over 18 and my date of birth is registered in my Google Account
  • Brazil is my current location
  • Gemini web works normally with this account
  • Google AI Studio does NOT work with this account
  • Google AI Studio works normally with another personal Gmail account
  • Tested in Chrome
  • Tested in Incognito mode
  • Same computer
  • Same internet connection
  • The problem persists in Incognito mode
  • No VPN is being used
  • There is no Google Workspace administrator involved
  • Google Payments does not have a conflicting payment profile

The issue appears to be specific to this Google account.

Could you please check whether the account has an AI Studio/Gemini API entitlement or eligibility issue on the backend?

Thank you.