In my attempt to fix the endless prompts for signing in to my Google accounts in Calendar, I removed them both from the Internet Accounts list.

But now, when I try to add them back, I get stuck.

In Internet Accounts, I click '+', select Google, then get the prompt:

"Google requires completing authentication in Safari. After authentication, setup will continue in Internet Accounts"

I click Open Safari

Safari opens but it just sits there on a blank tab. No prompt for login, nothing in the URL bar.

Same thing happens if I try to do add an account via Mail, or directly through Internet Accounts in Sys Prefs.

Have rebooted, have logged out of google accounts in Safari.

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