OMG. You’ve been through the same foolishness. Installing 32 bit Office 365 worked for me too - thanks to you. No need to change the user access control or repair or reinstall.

I had four calls to QB pro advisor hotline and they convinced me QB Desktop wouldn’t work with Office 365. Hmmm it has been working for 2 years. Out of desperation I actually bought a stand-alone Office 2016 licence with no luck. 

I agee with your comment - QB needs to update its responses online, train the phone tech support but also explain why 64 bit stopped working. 

Thank heavens for individual contributors like you. 

S