Firestick / HD modulator

Hi - wasn’t sure where to post this but hoping someone can help!

I have a firestick plugged into an Onkyo AV receiver. The AV receiver output is sent round the house via an HD Modulator so that whatever I select on he receiver (firestick/sky etc.) can be viewed all around the house.

My issue is that I can’t get any sound on other TVs when trying to watch the firestick. I think it’s something to do with the sound output settings but can’t fix it!
 
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