Can’t adjust volume on Vizio TV

I cannot adjust the volume on my Vizio TV. For whatever reason, everything else works except the volume, which is stuck at a very low level (not mute).

  1. I confirmed that my remote controls work and can adjust volume on another Vizio TV in my house.

  2. All other buttons work (I can pause, select, etc) on my remotes.

Has anybody seen this issue before? TIA