I had a deco mesh with 3 deco m5 units but was having trouble with network instability i thing cos there was getting to much devices on the telenet router . 

I decided to upgrade my mesh with a be65 and set is as main deco in router mode .

Everything worked and all devices connected to it after i changed te ip rage of both of them but i cannot get the casting function to work out of my homeassistant .

It used te work for the doorbell sound but now is the radio is playing on my sonos speakers the radio mutes but the doorbell sound doesnt come out . Its like it plays an empty stream .

I tried casting to other devices same issue , i tried tts same issue . When i play the sound say on my computer it works if i play the media on the tablet it also works ( if i try to play it from my pc on the tablet no sound .
So i think the deco router is blocking something .

I read i needed to activate multi cast but i havent found that on the deco app . Its very limited settingswise i think .
Anyone here that can help or solved similar issues ?

Hope someone on here has some solution exept revirting back to using the telenet router .