I have installed and configured half a dozen Jellyfin clients on the Xbox searching for one that can listen to a friend's stream ("SyncPlay") in the background. The official client supports sync but not background music. Jump through all the hoops to install Kodi and its multiple jellyfin plugins to find out Kodi stopped supporting background Xbox play years ago. VLC can open a stream but as of last year no longer supports background play either...

The Gelatinarm client can stream music from a Jellyfin server in the background but it doesn't support the SyncPlay feature.

People talk about the death of social media but with Plex killing Watch Together last year you can barely tell that anybody ever tried.

The easy way to pipe Jellyfin -- or any audio -- into an Xbox-Discord game chat is to use Blackhole to make your audio out an audio input and then pipe that into the Discord chatroom via a 2nd account that DJ's the music. Other users can control the jukebox by signing into the Jellyfin SyncPlay session.

https://existential.audio/blackhole/

BlackHole: Route Audio Between Apps

Zero Latency. Perfect for Streamers, Podcasters, and Online Instructors.

To make command line aliases to swap the audio back and forth between the system and the pipe you can install switchaudio:

SwitchAudioSource -t input -s 'BlackHole 2ch';SwitchAudioSource -t output -s 'BlackHole 2ch'

https://github.com/deweller/switchaudio-osx

GitHub - deweller/switchaudio-osx: Change the audio source for Mac OS X from the command line.

Change the audio source for Mac OS X from the command line. - deweller/switchaudio-osx

GitHub
Plex has this infuriating infinite-scroll presentation of playlists that makes it effectively impossible to remove a song from one. Jellyfin is sufficiently archaic it just spills thousands of tracks into a simple page. Find in page. Trivial work for today's adware-hardened cores.
I do not understand why #Jellyfin does not display the artist and album in the current playlist.