Auth 2.0 Error 400 on Mail account

I try to add my account but I got this message

Authorisation Error

Error 400: invalid_request

You can't sign in to this app because it doesn't comply with Google's OAuth 2.0 policy for keeping apps secure.

You can let the app developer know that this app doesn't comply with one or more Google validation rules.

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redirect_uri: urn:ietf:wg:oauth:2.0:oob

What's wrong with Apple and Google? Google asks to contact the developer, yes Apple...

It's so frustrating...

Posted on Feb 22, 2023 2:58 AM

Top-ranking reply

jrginnyc

Level 1

8 points

Posted on Mar 23, 2023 8:39 AM

SOLUTION

In google, goto "Manage your Google account"...

On the left menu, select "security"...

Scroll to "2-Step Verification" (Mine was on already)...

Scroll to the very bottom of the "2-Step verification" page and select "App passwords"...

Select app menu, select "Mail" in the "Select Device menu, select "Mac"...

Click the "Generate" button and copy the password in the yellow box...

Open the mail app...

Archive your mail for the account you are fixing (if you need to, most people wont)...

Open system preferences from the Apple Menu...

Select "Internet Accounts"...

Delete the broken Gmail account here by clicking on it and hitting the - at the bottom of the window and close that window...

Go back to the mail app...

In the "Mail" menu, select "preferences" and add a new account with the + at the bottom of the accounts list making sure to select "other mail account" as the account provider and click "continue"...

enter the name for the account, enter the gmail email address, and paste the password you copied from the yellow box as the password.

TADA!

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Auth 2.0 Error 400 on Mail account

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