SOLVED: Failed loading Jellyfin install on Unraid Docker

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The published IP should be the IP of your Unraid box. You don't have to change the ports, but that can change how you access. I would change the IP to your Unraid IP and restart the container.

For the error you're seeing, guessing it's this: https://docs.linuxserver.io/faq#jammy

So you would probably need to add the additional line suggested in option 2, which you can do with one of the bottom two options (I think in show more settings).