Hey @antmar
Welcome to the Sonos Community.
It seems that your remote has to be programmed to be used on Sonos. Follow the steps below to configure your XR15 remote:
- Press and hold the “Setup” button until the status LED at the top of the remote changes from red to green.
- Type in 33919 on the number buttons. Additional codes may be found in the remote manual.
- If the code is entered correctly, the status LED will flash green twice. If the status LED blinks red, then green the code was not entered correctly. Check that you are entering the correct code and try again.
- Use the remote to operate your Audio/Other (use Power, VOL, etc.)
- If these steps don't work, try another 4-digit or 5-digit code and repeat the above.
Once the code has been entered, try the remote control setup on the Sonos app.