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 10.10.3 (Docker)
Ubuntu 24.04 LTS
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
3x WD Red Pro 6TB CMR in RAIDZ1 (JF Library)