Hello,
I bought my son a 46" Hisense 4k ultra tv for Christmas and they have something called the Opera TV Store where you can download apps and as luck would have it, there was indeed a Plex app, we downloaded and installed and I even logged into my account just fine, however when I load the app and click on any profile, even ones that don't require a Pin number, I get the message Not Available - any clue what's wrong or how I can fix it?