Apple TV shows airplay code in case I try to play any track both from my library and for Qobuz streaming. There is nowhere to input this code. At the initial setup Roon asked that code and prepared ATV as a airplay audio device. So I see it at aidiozones.
How to get rid of that code or where to input it to?
On the Apple TV, if you go to Settings > AirPlay and click on Airplay Everyone, you will see Security below. This might show Require Code First Time Only but should be changed to a Password.