In older versions, the authentication method is “Normal Password Authentication” and the application password must be issued on the Google Account side. Google’s 2-step authentication, “OAuth2” supported by older versions of Thunderbird, is not compatible with the current Google. In view of the latest security measures, I strongly recommend that you migrate to the latest version of Thunderbird 91. In short, I believe that Gmail will no longer be available in versions older than Thunderbird 68. Less secure apps & your Google Account – Google Account Help Google will end support for insecure apps (e.g., older versions of Thunderbird) on May 30 of this year. Is that correct? Or will all Thunderbird users have to upgrade to version 91 in order to make Gmail work?
Click the pencil icon to the left of "4OnlyDomains", type in as a point of clarification, older thunderbird versions eg from 36 to 78, already have OAuth 2.0 so they won’t need to do anything. Select General, if not already selected, then scroll down and select the 'Config Editor.' button. Select the Tools menu then Settings option. If you are seeing the error message 'User is authenticated but not connected' please try the following: You must ensure that your username on that screen is not connection errors When authenticating, you'll see the usual Cambridge University screen for your username, password and then multi-factor authentication (MFA). 
SMTP username: SMTP authentication method: OAuth2. IMAP username: IMAP authentication method: OAuth2. In this example, your username is your individual mailbox in the format and the shared mailbox is in the format IMAP Use the following settings to connect to a shared mailbox that you have authority to access. Click the Re-test button and it should then appear as an option in the drop-down list. *If you don't see OAuth2 as an option, fill out the other details and leave the Authentication Method as 'Autodetect'. You must ensure that your username on that screen is and that you use your associated password and additional authentication mechanism. Username: authenticating, you'll see the usual Cambridge University screen for your username, password and then multi-factor authentication (MFA). Then enter the following server settings: Incoming server When setting up your account, enter your email address in the format and select 'Configure manually'. You can download the app and find instructions on how to use it at.
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