Out of the blue...I launched Outlook 2011 for Mac (Like I always do) and it came back with a sign on screen...which it never does.  Then it rejected my user name and password.  And gave this error:  Sorry, there was a problem while trying to connect to your account. (Error code:0x80048823)

I uninstalled, reinstalled, double checked user name and password and still no go.  My license is not up until next April...but perhaps I am confused.  I have a key for Office 365, I tried to enter, it says it is no good.  I have a Microsoft 365 account that entered, that says password/account is bad.  Am I confusing to separate things?  I may have bought Outlook separate from Microsoft 365..I can't recall.

  What can I do?
Thanks,
NP