I scrolled down to say "make sure audio is enabled in the settings..." but im too late to the party hahaha.
Related: The high failure rate of these new BU cams is infuriating! I bought a new one about four months ago. The camera started failing within two weeks (broken wire, of course). My project manager sent me a loaner with a simple tweak to prevent "Lawmate Broken Wire Syndrome." They molded a tube of epoxy putty from the base of the connector (overlapping it just a bit) then up the cord four or five inches. No more bending at the stress point, much less risk of broken wires.