Open RG Studio on your computer or phone, click “New screen”, and enter the code above.
Before it plays anything, the player checks that your ads really come from RG Screens — and it can’t do that check from an address without “https”. Open the player at the https address of RG Screens, or use the RG Player app on the TV box.
It keeps trying on its own — you don’t need to restart anything. Check that the TV box has internet and that the address above is the one from your account.