iMessage Activation Error

Prior to updating to iOS 11.1 my son's iMessage and FaceTime were working just fine on his iPhone 6. After the update to iOS 11.1 his iMessage and FaceTime both stopped working and is now stuck on Waiting for Activation. I tried to sign in with the AppleID but it keeps giving the Activation Error. I then decided to try using my AppleID and it signed in just fine. Does apple block or deactivate AppleID's? I'm still able to sign in online using the account but can't use it for iMessage and FaceTime anymore for some reason. Thanks in advance for any help.