I did get the report to generate using the instructions above, so it did work for me.

But my big complaint is this:  I'm trying to use this report as a poor substitute for another report I REALLY need.   I need an Expense by Vendor Summary, but only for select accounts.   The format of the Expense by Vendor Summary for what I need.  But I am completely baffled that you cannot filter on select accounts in that report.   In many other reports (like this Transaction Detail) you can select specific accounts.  But not in the Expense by Vendor Summary.

The thing is I first noticed this over 2 years ago, and have opened tech support tickets, done chat sessions and have entered it as a "Feedback"  .   But I've now lost hope that this will be resolved.
I'm also a long time user of Quickbooks Desktop, including being in the Proadvisor network for years.   But you sometimes get the impression that the developers of QBO have never done accounting in an actual company.