I get error message 400 when adding a Google Workspace email to Apple Mail

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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".

https://discussions.apple.com/thread/255361223?answerId=260028169022&sortBy=oldest_first#260028169022

Thanks bosmacs!

stevensmacdonald wrote:

I get this error message when adding a Google Workspace email to Apple Mail...

400. That’s an error.

The server cannot process the request because it is malformed. It should not be retried. That’s all we know.

start here https://support.google.com/mail/?hl=en

Same problem, and it started happening with MacOS 14.3.1. It doesn't appear to be Google's problem because Google send a confirmation message that access was granted. In the past this type of error was due to outdated security compliance in the Apple Mail app.

That's the fix - thanks much!