I play videos on LibreElec using the Jellyfin plug-in and everything seems to work fine. The audio signal goes to the TV via HDMI, then from TV to the sound sys

I play videos on LibreElec using the Jellyfin plug-in and everything seems to work fine. The audio signal goes to the TV via HDMI, then from TV to the sound system via optical cable. Are you connecting directly from the player to the sound system?