Carplay says No Internet Connection
Cannot use Apple Maps with CarPlay in a 2017 Hyundai Elantra via USB -- instead I get an error message "The Internet connection appears to be offline". I'm using an Phone 6s with iOS10.3.2 and carrier is AT&T Wireless. Problem occurs both with and without using personal hotspot, although it works fine when sitting in the dealer's parking lot connected to their wifi. CarPlay's other functions do work: Messages, Phone, Music. Car itself does not have wifi. Any idea where the problem is (car? phone settings? carrier?).
iPhone 6s, iOS 10.3.2