Hey I hope you already figured it out on your own! I think it is a bug that the PUID and PGID env are with no effect on the Docker Container. But to fix your issue: you can add --user 99:100 to the extra parameter-field when selecting edit after clicking on the Jellyfin Docker Container. Most likely your container won't start because you have to chwon the appdata to 99:100: On your unraid host: chown -R nobody:users /mnt/user/appdata/Jellyfin