Q90 65", Sonos playbar, Xbox and surround sound help needed

[Stoch]

Good evening,

I have recently got the the Q90 65" with the connect box. I have it connected to the Sonos playbar via digital optical cable and have an Xbox one plugged into the connect box. 

I am having problems getting the surround sound to work when using the Xbox. How can I ensure that the connect box passes through the surround sound to the play bar? 

Any help would be appreciated

[Skellionz]

I would assume you have to set the audio on the xbox to hdmi not optical as you don't have it directly plugged in.  You are likely to have sync issues on 5.1 though if the tv is decoding