Which phone are you using?
APPROVED LIST
iOS V4.3.3
Requires iOS 9.0 or above.
Compatible with iPhone X, iPhone 8 Plus, iPhone 8, iPhone 7 Plus, iPhone 7, iPhone 6s Plus, iPhone 6s, iPhone 6 Plus, iPhone 6, iPhone SE, iPad Pro, iPad, iPad Air 2, iPad mini 4.
Optimized for iPhone X.
Android...