The inbox you've been using is no longer available. This can occur when your account is owned by an organization, or when someone else confirms ownership of the email address.
You haven't lost access to the other services you use with your Microsoft account. However, you must choose a new primary alias to continue.

I only set up one email and one alias and I have never changed it.  My account shows this email as my primary, but somehow it is not being recognized as me.

Please advise.