On mine, I had to do two things. First, I had to ensure that I was plugged into the HDMI ARC connector on the TV. The other thing was I had to ensure that the stereo was looking at TV2 for the input. Good luck.
Current: 2020 Rockwood MiniLite 2205S
Past: 2018 Flagstaff MicroLite 21FBRS
Past: 2005 Flagstaff Classic 625D
TV: 2016 Ford F-150 3.5 EcoBoost