Homekit, Airplay2, AppleTV4K and Denon AVR2400H

Hi all !

So I have my MacbookPro (2019) and its music, an AppleTV 4K managing homekit, a Denon AVR and iphones, ipads etc...

The Denon AVR is Airplay2 compatible.

I have added it, along with the Apple TV to my Homekit app (it shows on my iPhone as well as on the mac's app).

So when on my Macbook Pro I ask Siri to play music on the amp I see it tries but ends up telling me it has trouble connecting to it.

Weirdly enough, if I go into iTunes and manually set the audio output to the amp all is well...

I prefer using my mac because its iTunes library is on a NAS on the network, and mostly composed of FLAC files, which are better than what iTunes can provide for now...

Any help would be appreciated... :)