how to add the apple id in Xcode 7.3

Question

I am facing problem in adding the new apple id in xcode 7.3, it shows waiting since long although i have entered authentic credential and also checked proper internet connection.

Answer 1

So basically after a long time:

I am getting the problem why it comes:

In my case, Mac mini doesn't have the serial num it display unavailable so the problem comes.

Just like that

Basically, it comes when Apple unable to verify your mac for some reason so you have to contact to apple care.