Protocol handler check: antigravity:// is registered correctly
Result of local test: start antigravity://oauth-success does not throw a Windows protocol error
Issue:
Google sign-in succeeds in the browser
Browser shows “You have successfully authenticated”
Antigravity stays stuck and does not complete sign-in
What I verified:
Protocol registration exists in Windows registry
Redirect mapping is present
Local browser/protocol setup does not appear to be the main issue
Patching local main.js did not resolve the problem
Observed error:
TypeError: Do not know how to serialize a BigInt
Notes:
This appears similar to other March 2026 reports where Antigravity on Windows fails after OAuth success, especially on v1.20.5/v1.20.6 and in some cases only for specific Google accounts.
Can you try deleting the Antigravity folder in your %appdata% folder?
First Unisntall Antigravity from the Settings > Apps menu. Move to the next step after you uninstall
Click on the Start menu
Type: %appdata%
Press the Enter key on your keyboard
Locate the ‘Antigravity’ folder and delete it
Restart your computer with Start > Restart
Install Antigravity and try signing in
If it continue to fail, repeat the steps and also clear the cache and history from your browser. You can also try switching the default browser before signing in to Antigravity.
Same issue here as well. Were you able to resolve it?
I have AI Ultra for Business subscription . Started facing 429 errors and tried to logout and login. But cannot login back now.
Also have a Personal Pro subscription account but cannot login through that also.
I was able to login by rolling back to previous version 1.21.9. Temporary fix until there is an official fix. Just downloaded the last version and installed it on existing installation.