I have never had an issue, in the past, controlling the sound from my Roku Ultra remote control and Sonos Playbar from my LG TV.
Recently, the Roku remote stopped working. I replaced the optical cable for the Sonos Playbar to my LG TV, I made sure my LG TV was set to Optical, and I checked the Roku audio settings. I can control the sound from the Sonos app on my phone but not the Roku Ultra Remote. Does anyone know what the issue maybe?