Jellyfin: The Free Software Media System

I'm running both plex and jellyfin on the same server with same media and same tv box. My hardware setup is ok, I have surround audio with plex on my avr via toslink. I'm trying to transition to jellyfin but I need to iron these out. Audio in jellyfin is stereo only. In my jellyfin server I have audio set to max 5.1 channels, on the android tv app the audio is set to direct. When I start a movie with plex the avr receives signal and switches to dolby digital or dts mode. When I start playback with jellyfin with the same media the avr switches to stereo. I cannot find any other settings to tweak. Please let me know what am I missing.