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Can't connect Gmail to Macmail (Sonoma 14.2.1 on M3 MacBook Pro)

I have two Gmail accounts that appear to have identical configurations. One is added with no problems to Macmail but the other keeps failing. Both accounts work fine in a browser and on iOS phones. Have tried each alone without the other account.


Mail >

Accounts >>

Add account...>>

Google >> (Google requires authentication in web browser) >>

Open Browser >> (This opens Safari and Sign in with Google) >>


I sign in with no issues on either account. But one Gmail account goes directly to populating the email. The other comes back with a "Continue to sign in request" in Safari, where clicking to continue or cancel brings a 400 error.


I have examined both Google mail accounts and cannot find any consequential difference between them.


Thank you for any advice you can provide!

MacBook Pro 14″, macOS 14.2

Posted on Dec 21, 2023 9:44 PM

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Question marked as Top-ranking reply

Posted on Jan 5, 2024 4:34 AM

The issue appears to be Safari's "advanced tracking and fingerprinting protection". Go to Safari's Settings -> Advanced and uncheck "Use advanced tracking and fingerprinting protection".



After this I was able to re-authenticate my Google account without the 400 Bad Request error. Once the account is reconnected, you can enable the option again.

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41 replies

Feb 7, 2024 8:02 AM in response to drjzimm

drjzimm, sounds like maybe you have an older version of Mac OS. Also if you have had this problem since 2013, I'm guessing it is caused by something else and unchecking the "Use advanced tracking and fingerprinting protection" box wouldn't solve your problem anyway. Maybe you could start a new thread with more details about your exact problem.

Feb 7, 2024 10:21 AM in response to drjzimm

drjzimm. That may be true, unfortunately. It's probably unrelated, but several friends have decided to upgrade their Mac computers because they could no longer view the Wordpress based web page for our organization in Safari. In one case this was avoided for a while by using Firefox or Chrome instead of Safari.

About two years ago, I upgraded to a MacBook Air M1. The difference in performance compared to my older Intel MacBook Pro was astounding! So if you do get a new Mac with an Apple processor, I think you will be pleased with the improvements.

Can't connect Gmail to Macmail (Sonoma 14.2.1 on M3 MacBook Pro)

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