iPhone Doesn't Ring for WhatsApp Audio/Video Calls when Screen is Locked in iOS 13.4 - Fixed

No ring on incoming whatsapp calls on iPhone, whatsapp call not showing on iPhone 11 Pro Max, whatsapp video call not ringing on iPhone X, XR, XS and XS Max, iOS 13 Whatsapp Audio or video call no Ring, Whatsapp call not Ringing when Screen is locked in iOS 13, whatsapp not receiving messages until manually launch it in iOS 13, iPhone 8 plus and 7 plus don't ring for whatsapp audio or video calls.