I recently got Disney + and the first few days it worked fine, but for the past few days Disney + just doesn't load anymore. It can't really be due to the internet, since anything like Netflix, Twitch, Youtube is all possible. Maybe someone has an idea why this could be and how to fix it?
Uninstall and reinstall.
Had the same problem and I was informed by the support that until now it was only available via the app on the phone or not all TVs. For many not even to the full extent, much is missing. I also stream it on my cell phone and then on the Chrome Stick (Cast).
You can do the same with your FireTV stick.
Disney + has been struggling for days. You are not the only one with problems.
https://gibteseinestorung.de/status/disney-plus
So you can only exercise patience until the problems are resolved.