iphone X cannot activate imessage with apple ID
Hi.
Since I switched to my new iPhone X, I can not sign in anymore with my Apple ID to my iMessages and FaceTime.
In this case I can use it for my iMac as well. It was working with my iPhone 7plus before.
I tried everything I can find in the internet, like deactivating iMessages, reset the phone and I tried the same with my wife's iPhone X, and she has the same problem. Please see the screenshot below for my error message.
Thanks.
iPhone X, iOS 11.2.1