Check out this discussion:
https://www.tacomaworld.com/threads/entune-and-iphone-messaging.424963/page-3
The very last post:
OK if you have quick contacts on your home screen or have quick contacts setup while using an iPhone 5-6s it will not work.
Unpair your phone, forget device under bluetooth on iPhone and remove cached data in setup on Entune.
Now start setup of iPhone and Entune as if you are new to system, DO NOT setuup quick contacts on your home screen on Entune, ensure you have notifications turned on iPhone in the bluetooth settings.