Why is my FaceTime not working for one person?
Why Doesn’t FaceTime Work With Only One Person? The other person may not have FaceTime turned on, or there may be a software problem with their iPhone. It’s also possible the network they are trying to connect to may be causing the error. If you’re not sure, try making a FaceTime call with someone else.
Why is my FaceTime call not connecting?
Reactivate the application
Sometimes, connection failures can be resolved by reactivating the app. To do this, go to your Settings and find FaceTime tab. Open it and turn it off. Then turn it back off and wait until the activation is completed.
