Hi DenisK1,
Thanks for reaching out to us in our community and welcome back, I am sorry to hear you are having issues registering a device for the Sky app, you can find more help and support around this here.
If you are still unable to do this I will be happy to reset your devices, to do this I will send you a invite into a private chat, I will send a invite shortly., please click on the purple envelope to accept?
Regards
Paul.