Hi
I have been having seemingly exactly the same problem. I spent 4 hours today fiddling with the R24 drivers on Windows 11. Here's my experience:
R24 can play audio from windows
R24 appears to be working perfectly in terms of cubase playback. I checked every variable.
R24 does not produce any sound when used as an ASIO device.
I'm very keen to find a solution to this and wondering if anyone else is having a similar experience.
Paul