A: When using OAuth2 authentication with a shared mailbox, you should only need to put in the shared mailbox address as username and no password in IMAP. The authentication part is done by OAuth2 and for the password we’ll use the OAuth2 Access Token automatically.
Feedback customer: ‘With the shared mailbox in the username field it works!!’
If you need any help with this ‘shared office 365 mailbox’ request, please let us know.