Hi, Jon, Yes, I'm using CCP on Windows 11 ARM under Parallels 17.1 on a new Apple Silicon Mac. (FYI, the latest 17.1 will offer to install Win 11 for you, and it is very fast to just go download it for you and install the software TPM to make it work. No dramatics needed.)

My MX-880 and MX-890 connected with no problem. As far as I can tell, they were recognized by some signed Microsoft driver, so I didn't need to try to install any unsigned URC drivers.

Then I got a used MX-880 that must have been an older model, and it is still not working in this setup. Needs a driver to be installed, went through the steps to put Win 11 in the mode to accept unsigned drivers, but I still haven't gotten a solution on this machine. What did work with this odd-ball MX-880 was hooking it up to an old Windows XP VM on an older MacOS Intel laptop. The unsigned URC driver installation went without a hitch. Picked the directory with WinXP drivers and it picked the one it wanted.