[Antigravity] Cannot authenticate with Google AI Pro account — works with non-Pro account on same device

Hi everyone,

I’m experiencing an authentication issue with Antigravity that seems to be specific to my Google AI Pro account.

The problem:
After clicking “Log in with Google” and completing the OAuth flow, I get the error:

“There was an unexpected issue setting up your account. Please try again later.”

The status bar shows “Antigravity: Authenticating” for a while before the error appears.

Key finding:
I tested with another Google account (non-Pro) on the exact same device and network — it authenticates successfully. This rules out device or network issues and suggests the problem is account-specific.

What I’ve already checked:

  • Google AI Pro subscription is active at one.google.com :white_check_mark:
  • No pending payments or account warnings :white_check_mark:
  • No ban or suspension email received :white_check_mark:
  • Issue persists across multiple attempts over several days :white_check_mark:
  • Already contacted gdp-premium-support@google.com

Has anyone else experienced this? Any workarounds?