Shot in the dark, here; my girlfriend has had trouble with her Xbox One randomly losing audio on some games, which is sometimes fixed by switching back and forth between apps, and sometimes fixed by force-closing the game and restarting it. Have you tried force-closing and restarting OneGuide (or whichever app lets you watch from the HDMI input)?
Is there anything in the audio settings on the Xbox One that might cause no audio to pass through? Do any other HDMI devices work with sound?
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