I have never be able to get apps like Facetime or iCloud to ever work. I want to change that.

Ever since apps like Facetime and iCloud popped around the time of Snow Leopard I have never been able to get them to work properly, due to the fact they have some sort of detection genuine Apple hardware. Now in the days of High Sierra with so many Apps using this detection I really want to try again to get them working. I've tried many times with older versions of Mac OS, from Snow Leopard to El Capitan and I've never been able to get them to work. Useful guides would be appreciated. Thanks.