Personal Gmail account ineligible to sign in to Antigravity despite paid Google One / Google AI Pro subscription

Hi Antigravity team,

My personal Gmail account is unable to sign in to Google Antigravity / Antigravity IDE.

The error message says:
“Sorry, this account is ineligible to use Antigravity”

It sometimes also shows:
“Authentication failed”

or:
“not currently available in your location.”

This is a personal Gmail account, not Workspace. I am also a paid Google One / Google AI Pro subscriber. Gemini and other Google AI features work normally on the same account. The account profile address and current IP are both in the US, and the account is over 18.

This is materially affecting my ability to use the benefits associated with my paid subscription. Could someone please check whether this is an Antigravity account-level eligibility, entitlement, or location-association issue?

I can provide the affected Gmail account privately.