Can't access GMail account on my Mac using Mail

I use Mail on my iPhone XS iOS 17.2.1 and on my MacBook Air MacOS Monterey 12.7.2 to access 2 Gmail accounts.

Recently Mail on my Mac showed one of my accounts was offline although it was fine on my iPhone and via the web. Whenever I followed the instructions to correct it via Connection Doctor I end up with the message "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."

I eventually deleted the account on Mac Mail but am unable to add it again as I still get the same message.

I have tried contacting Google support at 650 253 0000 and the 844 # but the Bot just sends me down the same path and if I force it to get me to a human it rings forever with no answer.

I'd appreciate any help to fix my problem or tell me how to reach a live person at Google. Maybe I should just get an iCloud account for my mail but I dread all that it entails to change over.