Airplay shows up but doesn't connect

Hey, since yesterday I can't connect via Airplay to my NAD C368 anymore. Issue started after updating iOS (17.3.1) but it also happens on macOS (14.2.1, which I didn't update). The NAD appears as an option to connect but when I try to it says it can't. Other devices (non Apple) do connect and work fine.

Any idea?