I can't connect from WebOS Jellyfin

[Ivan Greguric Ortolan]

We do not control how LG implements their software so the choices are, unfortunately, to reduce security or get an Android TV dongle, Apple TV, Firestick, or Roku instead.

To be honest it has nothing to do with LG, it simple browser security headers. The WebOS Jellyfin app uses iframes apparently to render the webpage and standard security headers recommended in the NGINX page cannot work.

I would assume the WebOS app is broken for everybody because of the probable changes that have been done in the index.html of Jellyfin recently

p.s. NeutralExcitement you can remove "frame-ancestor: 'self'" from the content security policy and it should work although there are still some issues in the CSP. To debug the app you can use ares-cli, it can start the inspector and you see exactly what is going wrong in you browser.