Is port 8096 on the server the port that is sending data to port 8096 on Jellyfin?
What I mean by that is that you can choose the NAS port that forwards to the Jellyfin 8096 port. I have my docker image set to run port 55000 (server) to port 8096 (Jellyfin) so I then connect to the server at 192.168.x.x:55000 on my local WiFi.
Hope this helps (or that I at least understood your issue). I'm fairly new to self-hosting myself.