I get no audio output as there are no “wired speakers” as the hdmi goes to a projector with no speakers so the default audio device does nothing. Additionally in the Sonos app, it shows “playing from airplay” when using the Spotify app on the Apple TV, but when using Kayo and also the 9Now app and a few others, the Sonos app shows as the speakers not playing, as if the Apple TV isn’t transmitting the audio at all.
As this is a problem I experience in more than one app I would assume it’s not just a problem with the app itself, and maybe how the Apple TV receives the audio stream?
Also I found a very temporary work around where I toggle all the audio outputs in the Apple TV settings on an off and try streaming inbetween tries and it eventually fixes it but this is extremely time consuming and inconsistent.