Ubuntu normal release running Docker containers.

Had various issues with Debian Bookworm, not being able to install the “server” meta package on one server which left me without all the basics but “apt” and issues with lost IPv6 connections that made me switch to Ubuntu

You can use duckdns.org to create a subdomain, set the domain name to your local IP and then use let’s encrypt DNS challenge to issue a trusted certificate

Depending on your routers you might me able to set up a “site-to-site” VPN which means your Xbox could connect directly to your Jellyfins local IP