Why can't I call into calendar appointments using Android Auto?

[AC Question]

I am running the latest Android Auto build and I regularly have to call into meetings scheduled as calendar appointments. When my phone is plugged in I can no longer access the meetings on the phone and I can't find a way to access them via android auto. meetings with physical locations seem to pop up as tiles but if there is a phone number as a location I have no way to get access (even to see the appointment) let alone call in. Any ideas?