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Outlook | Windows | New Outlook for Windows | For business
Using New Outlook on Windows for professional communication and productivity
The problem appears to be only with the outlook.com email. It does not happen with my optonline, roadrunner, yahoo, or gmail accounts. I changed the primary email alias in my Microsoft account from ***@roadrunner.com to my ***@outlook.com and the problem appears to have disappeared. The problem started several days ago, so I do not think it was associated with the 24H2 update. More likely is a change in the outlook mail desktop app that caused it.
I remember when the new outlook started rolling out, there was a problem adding the outlook.com email account if your primary email alias in your Microsoft account was not outlook.com. After I changed my primary email alias to ***@outlook.com I was able to add the account to the new outlook desktop app. One note on changing the primary email alias in your Microsoft account: It can only be changed twice in a seven day period.
Changing the primary alias does not appear to affect any access, you can still use any of the listed email addresses in the Microsoft account to sign in with.