Nothing is wrong with your account or your board. The browser that came with this TV is too old to show it.
Nothing is wrong with your account. Check this TV is connected to the internet, then turn it off and on again.
The fix
Still blank after a restart?
1Plug an Amazon Fire TV Stick 4K Plus into this TV.
2Add the Protiv TV app to it and connect your board.
Scan to get the one that runs Protiv TV.