Denon AVR 5600

Hi, I am having a problem with the discreet “on” and “Off” commands on my Denon AVR 5600 receiver (IR control). When I use the power toggle it turns on and off fine, but not having discreet on and off is causing some issues. If I try the discreet on and off commands straight from the test remote screen they still don’t work. Any help would be much appreciated.

It’s quite likely a model of that age simply didn’t get manufactured with support for the discrete codes. If the ones in Roomie don’t work, it very likely doesn’t exist.