Suddenly stopped being able to hear Dolby Atmos content

Apple TV 4k

Sony STR-ZA2100ES Receiver

LG OLED65B7A Television

Up until today, everything has been working fine. Tonight, my wife wanted to watch an Apple TV program that is in Dolby Atmos and we cannot get any sound. All other inputs work (Cable, Chromecast, PS5), all other apps withing the Apple TV work (Peacock, Max, Prime Video, etc.). Sound effects within Apple TV work. Switching to Dolby Digital for the program works. Unfortunately, Dolby Atmos has stopped working. Any suggestions would be appreciated.