Auto Connected Car not syncing with v5.1.1, what am I missing?

A

AC Question

Auto Connected Car not syncing with v5.1.1

I have an aftermarket stereo unit running KitKat 4.4.4 so I can't use Andriod Auto, but it came preinstalled with Connected Auto Car. I can connect to the head unit from my tablet running 4.2, and from a phone running 4.4.4, but can't connect with a new phone running 5.1.1. Is there something in the debugging options I should be turning on/off that I'm missing?
 

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