Took me a few hours, but I finally nailed it. The USB96 MUST be plugged into a USB 2.0 hub and that hub MUST be seen by the Mac as a USB2.0 hub. The native USB ports on the Mac are USB3.0, which the USB96 won't talk to directly. The last puzzle piece I needed was how the Mac identifies the external USB hub that is connected!
Under the top left Apple icon, go to About This Mac, then select System Report. Scroll down and expend the USB section. You should see the USB96 listed in there. Make sure the item above it is shown as "USB2.0Hub" and not Generic USB Hub. I have two hubs and the Generic one will show the USB96 but the Mac won't add it to the Devices lists in Logic or anywhere else. Once I moved the USB96 over to the USB2.0Hub, suddenly I can use the USB96 without any problems and I don't need the the PreSonus Universal Control software, either. Just the right USB hub.
My Mac is a 2012 MacBook Pro running Catalina 10.15.7. It has two USB 3.0 ports, which downshift to USB 2.0 if you connect a USB 2.0 hub to them. That's the trick. I tried to attach a screen shot, but it doesn't appear to be possible here. Perhaps Support can ask me for it via email.
I hope this identifies the missing detail for everyone that can't get this to work.