IIRC the Samsung regs iteration to join their club thing moved to only being on the US site. Once registered there you can sign in on the Samsung TV Smarthub and other exciting things and add your devices. I also seem to recall that became tricky since the search for models defaults to US so do the searches on the UK Samsung support site. Been a couple of years since I signed in and maybe this is why! I just remember it being a bit messy - you used to be able to simply log in from your home Samsung main page. If you still can, like you, I kind of lost hoe to do it. Good there is an app though - makes sense as presumably there is no need to enter any of the million numbers as the phone will deliver them directly I presume?