WebRTC no audio in incoming audio tracks

We are implementing a video room, similar to the examples in web_rtc_engine (the main difference is using a LiveView to broker the connection betweem client and room (genserver)) and for some reason we get no audio (on Chrome at least) for the other endpoints (local audio, when unmuted in JS, works fine).

Possibly related, we see that the controls for volume of the other endpoints are greyed out, as seen in screenshot.

Follow up question: is the audio HTML tag needed at all, since the video tag can also play video, or does that affect the tracks that arrive at the RTC engine endpoints?

Thanks in advance,
Pedro
Screenshot_2024-06-17_at_18.01.35.png
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