Phone Number Not Showing Up in iMessage and FaceTime on iPhone & iPad in iOS 14/13.6 [Fixed]

how to fix iPhone not showing up iMessage and FaceTime phone number, iOS 13.6 phone number not showing up in iMessage and FaceTime, phone number not showing up in iMessage on iPad, how to add phone number in iMessage on iPhone, iOS 14 phone number not showing up in iMessage.