I haven't seen this before, so here is [How to set up a multifunction device or application to send email using Microsoft 365 or Office 365](https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365). To whom it may concern, there's also a link to [Authenticate an IMAP, POP or SMTP connection using OAuth](https://docs.microsoft.com/en-us/exchange/client-developer/legacy-protocols/how-to-authenticate-an-imap-pop-smtp-application-by-using-oauth).
Michael
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