I am reporting a persistent authentication failure with the Google Antigravity desktop application.
The Problem:
I successfully authenticate via the browser and reach the confirmation page. However, the desktop application does not receive the handshake signal. After multiple attempts, the app incorrectly prompts me to enter a Google Cloud Project ID, which is not applicable to my account.
Troubleshooting Performed:
I have successfully authenticated in both Chrome and Microsoft Edge. I have completely disabled Windows Firewall across Domain, Private, and Public profiles. I have also cleared the local application cache and session data in AppData and restarted the system.
The browser confirms OAuth Success, but the app remains stuck or defaults to the GCH login screen. This appears to be a backend provisioning issue or a failure in the local protocol handler.
OS: Windows