Are you using a Microsoft Mail server and do you get an error message when retrieving mail, there is a good chance that Microsoft has implemented an update for you.
Log in to your Carerix application
Go to Maintenance → Settings
Check whether the IMAP OAuth2 function is activated.
If not, send a message to firstname.lastname@example.org and we will activate it for you.
If the OAuth2 is activated, you can use the following help document to further configure your mail: help.carerix.com/en/articles/4872803-email-sync-with-exchange-online-office365-how-to-activate-your-sync
Why are you receiving this error message?
Microsoft has an update planned for 2022 where OAuth2 (two-step verification) becomes mandatory. It seems that this update is being rolled out earlier than communicated by Microsoft.