Norrcomm
Just to note there is no password involved since you are using modern auth; OAuth2 is token based authorization. In any regard, since you made major account changes to the address in question (ie. changing licenses) you have to delete the existing token (in the Token tab within the Config popup in your screenshot) and get a new one. You see, when you change the password or do any other similar account changes it invalidates any existing authorized tokens for the account forcing you to reauthorize.
Before doing the above make sure you have all the correct API Permissions enabled and Admin Consented within the App Registration in Entra. Also double check to ensure you have IMAP enabled for the specific email address via the Exchange Admin Center. At that point you should be good.
Cheers.