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Just started getting this message and Mail is not connecting to gmail accounts. OS 12.4.
While this problem appears to have been addressed long ago, I don't see any recent updates.
iMac, OS X 10.11
Hello DonMatt,
Thanks for using Apple Support Communities. We recommend logging on to your email account through webmail to make sure there are no problems with your account settings or the servers. The additional steps in the following resource can help when your Mail account is inactive: If a mailbox is offline in Mail on Mac - Apple Support
Let us know the results. Be sure to include additional error messages and any other troubleshooting steps that you may have tried.
Have a nice day!
I can use Safari, then Google login, then get to any of my Gmail accounts, so I was finally able to get to the email telling me of your reply.
So using "webmail" works.
Just a reminder that this problem has started very recently and I have no new apps. I don't recall exactly when I updated to 12.4.
So, when I go into Mail it shows no gmail accounts connected and when I try to connect to that same account that I got to through webmail, or I click on that account in Settings/Internet Accounts, it tells me "Google requires completing authentication in your web browser", which then fails when I click on Open Browser. It won't even let me add a new Google account to Internet Accounts, telling me the same "Google requires ..." and then resulting in 'Authentication Failed. Failed to authenticate with Google, please try again later."
Of course, by now, I've "tried again later" many, many times.
While the problem impacts Mail, it appears to be rooted in a problem with Internet Accounts if it won't even let me try to start adding a Google account - I never even get to an email and password request screen.
Ultimately discovered that it was Kaspersky Security that caused the problem.
google requires completing authentication in your web browser
