Browser can find the domain and resolve the ip properly and load content. The app just says it can’t find anything.
How can I debug it?
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What is the app running on? Can a browser on that device find the URL?
Are you using https? On mine the app doesn’t allow just http.
Device/app?
Can the device resolve the server name? That’s handled by the OS, not apps.
Are you using the correct http/https syntax?
Do you have an authentication frontend like Authelia in front of your Jellyfin domain? Apps often break with that extra security layer in front.