Mojave 10.14.4 fails to Authenticate Gmail account

Same issue, only for me, I have 2 G Suite accounts, and when I removed them both in attempt to fix the issue, I tried adding account A back and it mislabeled it as account B; mail remains offline for account A. Tryin to add account B yields an error, that account B is already added. What a freaking mess! I rely on those 2 accounts for my business, and all related contacts and calendaring to go with it. Now I have to jump through hoops just to make things work. I switched over to my windows workstation to try to keep things going. This is a massive disaster for Apple!

Have you tried the manual IMAP set up? It works a treat. Just need to generate an app specific password server side and your G-Suite email accounts will work. Good temporary measure until fix is released.

I'm also having this problem. I called Apple and was on the phone with a technician for two hours. I have another session with him scheduled for tomorrow. I'm hoping the more people call Apple, the faster Apple will provide a bug fix.

Yes, that works only for account A, as account B still gives me an error. Also, calendar and contact sync isn't working, so I can't email any of my contacts and have no idea what my schedule looks like. I have my calendars pulled up in multiple browsers, but I think I might have to switch to windows, as I don't have another Mac I can use...

What baffles me is that, it isn't just a small security bug, or some sort of rare anomaly. By God, has nobody tested Google account functionality?! This is rudimentary Q/A! How did this ever pass Q/A!??

Apple is shifting strategy from software to services; I'm sure a lot of developers got reassigned to develop News+, which nobody asked for, and just like that, some cuts were made in essential departments; I'm sure Q/A dept. was all in on services.

I ran into this problem with my GSuite account when running the beta releases, and I reported the bug to Apple via the Feedback function. I eventually had to downgrade the OS so I could use Mail with my corporate email account. Unfortunately, it doesn't look like the problem has been fixed yet. Maybe there will be more attention to it now that the problem is affecting more people.

I too am experiencing this issue with 2 go my gmail accounts. This is ridiculous, just when I decided to come back to Apple Mail from using AirMail for years after the last time Apple did this. Hopefully they fix it soon as it also happens in iOS for the same 2 accounts. I have tried to remove and re-add on different devices and they all fail.

Having the exact same issue, except my Google authentication process in the 'Safari' pop-up window also includes the 2-Step authentication SMS. Password and SMS code are all correctly entered and accepted, but Mail continues to show 'login failure'.

Has anyone opened a case with Apple Support yet?

FWIW, I have a quite similar situation using the Gnome Evolution mail client with Gmail. My suspicion is that Google has changed its authentication (Oath2) requirements without updating its documentation on how mail clients are to do so. Since Apple mail is so important I hope Google will pay attention to this and update its documentation to reflect the current protocol.

Check the previous replies: At the moment the only fix is to delete the account and add it in manually as an IMAP account - if you have 2FA you will need to generate an App password - use that when you add the account back in. This will get you your mail but will not allow you to access Calendars or Contacts.

"At the moment the only fix is to delete the account and add it in manually as an IMAP account"

I tried that; unfortunately won't work unless your organization admin allows authentication outside the Google site login and I believe that's the default.

Same issue here;

• GMail account works fine

• G Suite account does endless authentication loop

• Issue only on MacBook Air, on iOS devices and Mac mini it works fine

• It worked for a few hours after 10.14.4 update then suddenly refused the next morning

"At the moment the only fix is to delete the account and add it in manually as an IMAP account"

"I tried that; unfortunately won't work unless your organization admin allows authentication outside the Google site login and I believe that's the default. "

I am not sure about that - I am the admin of our organisation and it works fine on the defaults. The app specific password still uses Google to authenticate?

I have exactly the same problem. Regular free Gmail accounts are working fine after a request to authenticate (again). However, all G-Suite accounts are looping back to require the authentication process again and again and it doesnt work.

Tried the same with Spark and is working fine as it seems.

This happened on all computers updated to MacOS Mojave 10.4.4 and no others !!

I tried the less secure option, I tried to deactivate 2 Step Verification, I tried with an App password, etc. Nothing works so far.