Can't stream with AirPlay or AIR

[ashbash]

I'm a new Devialet Expert 220 Pro owner. I can't stream from my phone. I have my TV STB on the optical input and that works. When I attempt to stream from Qobuz on iPhone using AirPlay (it does appear as an AirPlay device) the sound from optical input ceases but the system goes silent. I also tried with AIR on my Mac but it's the same, no sound. It appears the unit is changing "input" because to get back to optical I need to press "Source". But no sounds from the streaming "input". I'm using wired Ethernet, I am not used WiFi. 

Is there some setup config I need in the configurator to enable streaming over Ethernet?