Connecting Apple TV via new iPhone SE 20 to TV - not working
I've bought a generic HDMI adapter, purportedly compatible with iPhone X/8/7/6/plus, in order to play Apple TV on my television but, having connected the adapter per instructions, when I press play (on the phone) it says on both screens:
Cannot Play Film The connected display is not authorised to play protected films
Don't know what, where, how to authorise the "display" - presume this means the television?
Any guidance or direction to relevant information much appreciated.
iPhone SE, iOS 13