I'm trying to add a Microsoft365 email account to a new Outlook profile (installed & up to date from Microsoft365). The default Outlook profile does not sync for office365 email address email@example.com. I tried making a new Outlook profile to test.
I successfully added the problem address to the new profile2 - firstname.lastname@example.org
When I go to add another address, email@example.com, it fails
The Outlook autoconfiguration test runs, but does not prompt me for the domain2.com user's login details. It shows:
http status=401 (that's access denied I think)
autodiscover to https://outlook.office365.com/autodiscover/autodiscover.xml failed.
Testing autoconfiguration with a 3rd office365 email address (firstname.lastname@example.org, say) on the problem pc, I'm prompted to log in, and it succeeds.
Repeating the failed domain2.com autoconfiguration test on a different computer, 1) I'm prompted for the username & password, and 2) it works fine.
So there is a problem related to authenticating for this particular domain2 address on this particular laptop . It has been used before, so there may be remnants somewhere.
I have removed everything related to this account and Microsoft/Office logins in Credential manager.
I'm not sure what else to try. Uninstalling and reinstalling Office did not help.
Thank you, whoever replies!