I have such a setup For a long time. Everything works fine for many years. This summer i switched to an ATV 4K (not the newest model). Yesterday Volumen Up/Down stoped working. The Up/Down buttons control my AV-Receiver using IR. I tried the „Reset-Procedure“, mentioned everywhere but that didn‘t solve the issue. So i deleted the pairing to the AV-Receiver remote and wanted to pair it again, but i can‘t. The ATV remote does not recognize the signal from my AV-Receiver remote. The AV-Receiver remote works fine. I can also see the IR Led flashing in my ATV Remote, so no electronic problem there. I am on TVOS 16.2. Anyone else had this issue and can help me?