Mac doesn't sync with g-mail in Mac Catalina

Can you explain in a bit more detail?

Is is getting Mail at all, or is it the new Auth2 problem.?

Mail and Google's OAuth 2.0 policy

https://discussions.apple.com/thread/254696428?answerId=260216019022&sortBy=oldest_first#260216019022

Fix…

https://code2care.org/macos/fix-mail-authorization-error-400-invalid-request/

Mac's Mail App is not as modern as iOS's Mail app, Many eMail providers now require a separate App Password different from your eMail password…

If it's an IMAP account, delete it in Sys Prefs Internet Accounts then use "Other" instead of gMail choice to add it.

Most likely biggest factor is using Other in Mail setup, then using a Browser that doesn’t have gMail PW stored init to get the App PW.

Unable to add Gmail to MacOS mail - Apple Community

Thanks to Bob Sabiston…

iMac says Connection Insecure. Failed to … - Apple Community

Thanks to Webmb…

Sonoma can’t connect to gMail…

I'm no longer receiving mails on my iMac … - Apple Community

GC mac

User level:

Level 1

4 points

Nov 1, 2023 10:12 PM in response to Maggiellv

I also spent hours trying to solve this issue until I followed this video... It worked and my Gmail accounts are back on Mac Mail.

Give it a shot and good luck! https://www.youtube.com/watch?v=U0WPw2TsTAY