Outlook for Mac not launching

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Firstly, I've never joined a chat group before so apologies if this is the wrong forum to post this question...

 

Long term subscriber to Office365 (on a Mac).  Outlook has started to play up:

 

Firstly, Outlook was asking for my password on launch every time.  None of the recommended fixes on chat groups seem to work.

 

Secondly, I haven't been able to update software for Microsoft for months (automatic or manual).

 

Thirdly, Outlook will no longer launch at all.

 

(I've tried uninstalling and reinstalling all Office products).

 

Can anybody help?  Thanks in anticipation.

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