Hi Doug Smith,
It is a strange issue. You have done good job trying to solve the problem. So, right now the card reader and the card are working normally when tested separately on different devices, but they are not working together, right? I advise you to test the reader and the card together on another PC.
I believe the card reader and the micro SD card should be compatible, unless there is some specific manufacturer limitation. My advice is to contact the adapter manufacturer’s phone support and ask for assistance. Please, let us know if you find a solution.
Hope this helps