Starting March 1, 2026, Microsoft will start to remove support for Exchange Online Basic client authentication for SMTP with full phase-out as of April 30, 2026. D365 10.0.44 only supports Basic (user name/password) SMTP authentication. We are reliant on this functionality to send emails.

D365 F&O needs to support OAuth SMTP authentication well in advance to the start of this retirement to prevent loss of critical functionality.