Are you talking about the Windows user name changing? If so, I don't see why you'd need to change anything IN jellyfin other than, maybe, file ownership.
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