So I just refreshed my SD card using 2022-04-04-raspios-bullseye-armhf.img
and put it in a Raspberry Pi 3 Model B. Then I did:
sudo apt update
sudo apt full-upgrade
I then installed NR using the script and created the following flows
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I now have the RPI3 dashboard showing on Monitor 1 and I have a Mac with another monitor accessing NR from the RPI3. When I press the two injects, I see the volume slider on the Pi Desktop move up and down. So it is working fine for me. Try the flow I provided.
If it doesn't work there is something different between how I am doing things and how you are.
Are you accessing NR using the monitor/keyboard connected on the Pi or a different computer?
Do you have more than one user defined on the Pi?