I'm trying to get started with the Google Antigravity platform (the new Gemini 3 agentic IDE), and I'm hitting a wall right at the very beginning—the account setup phase.
The Issue I'm Seeing:

I successfully log in with my Google account (which definitely has access to the public preview), but the app just takes me to a screen that says something like "Setting up your account" or "Finalizing setup..." and then... nothing. It's an infinite loading spinner. It never moves past this step, even if I leave it running for 15+ minutes. It seems totally stuck in a loop.
What I've Already Tried (Troubleshooting Steps):
Browser Cleanup: I cleared out my browser's cache and cookies completely, especially for the Google and Antigravity domains.
Different Browsers: I've tested on Chrome, Firefox, and Safari, and the exact same thing happens every time.
Incognito Mode: Logged in through an Incognito window just to rule out any funky browser extensions. No luck.
Network: I'm on a fast, stable connection with no VPN or strange proxy settings active.
What's the solution for this??