When meetings are booked via Join.Me, GTM, etc. an incorrect Organizer name appears when populated into my Outlook calendar.  The program defaults to a contact I have named Aaron.   

I tried deleting this particular Aaron from my address book...then it started using the next person named Aaron in the address book...

Do I need to uninstall/Reinstall Outlook?  If so, how?   This is my 1st Mac.  Thanks!