If you are experiencing the issues after the above configuration attempt, use the following steps to verify that your server settings are correct. A window will pop up with a Permissions Request.If the service account does not have a password, you can request one at Microsoft 365 - Reset Service Account Password. For a service account, you will need to enter username_domain as the NetID (example: kb-helpdesk-team_doit), and you will need a password.You will be prompted to complete Two Factor Authentication. Click Done to confirm the creation of your account.Thunderbird should automatically discover IMAP as the available configuration and fill in the server settings necessary for your account:.Note: If you don't know whether you are attempting to configure a NetID account or a Service account, please contact your domain administrator. NetID Account: Enter Service Account: Enter For example, if your username was helpdesk-team-kb and the domain was doit, you'd type For multi-level domains, use the following format: do not enter in your password on this login screen.Your name: Your name as you'd like it to appear.On the Mail Account Setup window, enter information into the available fields as follows:.Profiles - Where Thunderbird stores your messages and other user data.Microsoft 365 - Email backup strategies.! Important ! If you have any files stored locally, it is highly recommended to back them up before attempting modern authentication.Select Email under the Setup Another Account section in the main window.

If you have other accounts configured, you can navigate here by clicking on Local Folders on the left-hand side.Launch Thunderbird to bring up the main Thunderbird interface.

O365 modern authentication