SMS Messages not coming through vehicle sound system

With my new P2XL Verizon edition, my 2014 Chevrolet Suburban announces my phone calls and I can talk/listen through my vehicle radio sound system. However, when it comes to SMS messages (using Android Messages) it stays within my phone. Nothing through the vehicle radio sound system. Is this normal for the P2XL on 8.1, or am I missing something? If I enable the Android Auto app, the SMS messages are announced and I can reply, but still only through the phone, not the vehicle sound...

SMS Messages not coming through vehicle sound system

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