The box came bundled with my fibre plan. While most OTT apps are preloaded, Prime TV isn't.

Anyway, I assumed it shouldn't be that big of a deal to sideload it. The Play Store on the box did not have ES Explorer or any cloud storage apps. So I managed to get the APK over with a combination of FX Explorer and a random WiFi file transfer app. So far, so good.

Only post the installation, the Prime TV app refuses to open. The first time I tried to open it, there was a username/password prompt after which the app just closed. I haven't been able to open it since. I even tried Prime Android TV app - I could install that, but the 'open' button on the screen right after installation is greyed out.

I'm at my wit's end now. Help me out y'all.

EDIT: The OEM of the box is some Chinese company called Skyworth, if it helps.