I solved the same issue on my Quickbook 2018 with Office 365 home. Strongly recommond the following solution:

Delete completely your current 64 bit Office 365, and reinstall a 32 bit version Office 365.

QuickBooks is a 32bit application, and requires the 32bit version of Office 365 to be compatible. If you have the 64bit version of Office installed, I recommend uninstalling Office 365 and reinstalling it as 32bit.