I am trying to enable iCloud keychain on my devices (Mac Book Pro and iPad Air). When I turn it on in settings it says waiting for another device to accpet access to it. I've waited for ages and nothing, probably because none of my devices use it. So I tried to "Approve with Security Code" but the number it sends it to I don't have access to and frankly have no idea what it is (I don't recognise the last two digits). I have changed all of the contact phones on my Apple ID to a number I have access to but still it tries to send it to this unknown number.