I am trying to add a Google account using System Preferences > Internet Accounts.
I already tried the following.
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able to reproduce this in 10.12.3 and 10.12.2.
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disabled OTP, same issue
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able to reproduce in Macbook Air and Macbook Pro
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same issue with both Gmail account (tried two) and Google Apps account
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I am not using any iCloud
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it appears to be similar to this issue but the fix does not work: Can't login with Google using Internet Accounts
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adding LinkedIn works
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I already tried to VPN to California and Singapore to check if something is wrong with Google mirrors
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creating a new user account and adding the Google account from there, same issue
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as advised by Apple Support tried https://www.google.com/accounts/UnlockCaptcha
It gets stuck right after a successful login. I took a screenshot.
Anybody experiencing the same issue?
Best Answer
Combining part of your solution and part of the solution from Can't login with Google using Internet Accounts, I got mine to work again by:
I was then able to go to System Preferences > Internet Accounts and add my Google account back. It showed the spinny wheel on the gray screen for a second, then disappeared and I was in! Mail and Calendar show my Google data now.
I have 2-factor auth enabled.
Another solution to this would be to login to your GMail account via another program that access's macOS's shared accounts, like Calendar.app.