Can't believe this worked, here's what I did to fix my sound. Like many other I kept coming up empty handed with searches along with following TCLs advice to check my volume on other settings.
Go to Settings > System > Advanced System Settings > Factory Reset > Reset TV Audio/Picture Setting.
Press the play/pause button 3 times.
I was looking for updates then realizing I was updated found the option to reset, and I never expected this to work because all my settings looked fine. I hope this works for someone as it did me!