Can't add 3rd Gmail account to Mail

I use Mail as my main email client. I'm on Monterey on a new M1 Macbook Pro. I currently have one icloud account and two gmail accounts connected. This morning, I'm trying to add a third Gmail account but it's not working. I first get the usual message that says "Google requires completing authentication in your web browser" - I click on Open Browser, but then I just get a spinning screen (see attached image) that just spins forever. I've tried adding the account several different ways including through Mail->Accounts, Mail->Preferences-> Accounts, and System Preferences -> Internet Accounts, and none of them work.

Any thoughts on this?