Is there a known issue with selecting the report type?  Omni-Channel trailhead using custom reports 

It shows correct report type in the screenshot, but still get the error. 

I did find an anomaly in the selection of the category.  I can only assume the app looks for the report in a specific category which has a miss-match. 

Any thoughts? 

See the "Store in Category" doesn't match what was actually selected.  Repeated the process several times, and other selections are shown verbatim of category selected and what is shown in summary... except for "Customer Support Reports"