What address are you typing into Jellyfin when trying to access it remotely? Your public IP (don't share that here)? If you are typing in the private IP (probably 192.168.X.X) that won't work.
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)