Does your No-IP domain include an AAAA IPv6 record? And port forwarding on your router has been updated? Some routers have separate port forwarding tables for IPv4 and IPv6.
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