I am having the exact same issue. I have updated to Quickbooks Desktop Pro Plus 2019 from the 2018 version. The export to excel was working in October when I did the third quarter taxes, but not anymore. I had hoped updating to the 2019 version would fix whatever is wrong, but it didn't. There was an update in December that I think is causing the issue in Quickbooks. Do you have a solution for this yet?