I also encountered that exchanging site asking me a valid ID for identification but i don't continued the processing request of registration because i don't want to exposed my identity in internet. Maybe they doing this for safety and security purposes of exchanging site and for those countries that banning bitcoin so they easily to traced of their members. And now i am in Binance and hitBTC easy to register and easy to used especially in newbie, well, i'm not promoting their exchanging site but i was trying to recommend you an easiest way of registering account.
So, happy trading mate.