Why OAuth not working without SMTP?
Why OAuth not working without SMTP?
We have configured the OPM mail server with OAuth method.
We have problem:
535 5.7.139 Authentication unsuccessful, SmtpClientAuthentication is disabled for the Tenant. Visit https://aka.ms/smtp_auth_disabled for more information. [WA2P291CA0007.POLP291.PROD.OUTLOOK.COM 2026-05-13T11:04:32.877Z 08DEB072EA66B246]
When we turn off SMTP AUTH:
