Thank you both for your insights! The first way I tried was through roles and exporting as mono and multichannel. But I still was getting both dialog and music in stereo (my settings were the same as indicated in the above image).
When I tried the panning technique, it failed as well. However, after trying again this afternoon with a new project, the panning worked! I had dialog in one ear, music in the other. I think the first audio clips I was using must have become corrupted with all my tinkering.
At this point, I’m just glad I have a way to export this without the show company having an aneurism.
Thanks again for your input!