Any update on this?  I just got Desktop for Mac 2020 and cannot connect to Office 365.  I have tried all the port numbers people have suggested.  I cannot find the "privacy" section under system preferences that people have referenced.  this seems like such a basic necessity and I cannot believe that QB/Outlook have not resolved this.  How do you run a business if you can't send an invoice?  And no, I do not want to create a pdf and email is separately.  For one, that's creating extra work and two, my clients cannot click on "pay".  Please help.