On the server click on Start > type Resource Monitor > click on the Network tab > expand the Listening ports table. Find jellyfin.exe on port 8096. What does it say for the Firewall status column?
Jellyfin 10.10.7 (Docker)
Ubuntu 24.04.2 LTS w/HWE
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
4x WD Red Pro 6TB CMR in RAIDZ1