ATT.net new Outlook install error 554 Email Rejected
Purchased new computer, email worked with old Windows 10 computer and Microsoft 365. New computer Windows 11 pre-installed and migrated apps. Microsoft 365 installed. Outlook errors trying to set up and retrieve email. from att.net. Latest Outlook error.
Send test email message: Cannot send the message. Verify the email address in your account properties. The server responded: 554 Email rejected
Have verified email address is correct. Have verified Security Key for login. Have called IP about connection and ok. Have tried both wireless and wired. Can access email with browser, iPad and iPhone. Cannot get past Test Account Settings to set up Outlook connection to att.net. Using att.net recommended POP settings and Ports.