When I try to add a Google account in preferences > internet accounts, I click "Open in Browser" and then there is an infinite spinner.
Do you have Safari Technology Preview installed?
I was just experiencing this same issue, and I discovered that if I launched the Safari Technology Preview app after the spinner was showing, after a slight delay it would open up the special private window to the Gmail login that was missing, and then things worked.
Safari, not Safari Technology Preview, is set as my default browser, so... apparently macOS is getting confused over which of them it should be using?
Thank you @leroydouglas. I wanted to set up an account for the calendar only (I do not use the Mail application). But if I use the Mail application, I can set up a Google account and choose to sync the calendar only, so it allows to work around the issue.
My Gmail was working perfectly on the mail app until yesterday. Now it is showing offline. I click on the ~ to connect. It states - enter the password for the account. Google requires completing authentication in your web browser. I click Open Browser and then the circular motion comes up and it just continues. It does not allow me to enter the password?
I'm having this exact same issue and I'm not seeing any resolution yet. @leroydouglas -- I am seeing the second window and that's the infinite spinner.
Gmail needs a one-time password to use gmail on a Mac.
Cannot add Google account
