Come to think about it, I have had a few occasions where the phone was still using its own microphone instead of the Durango's. This was in spite of the phone being connected on Android Auto, displaying Waze, and playing Spotify just fine. I could hear my phone calls just fine, but since the phone was in my pocket, nobody could hear me. It only happened once in a while. But after a few times, I tried pulling my phone out and speaking directly into it. That seemed to work. That seems to have gone away now that I've updated a bunch of stuff on my phone. So I suspect your issue could actually be your phone as well.
Android Auto on these phones is notoriously buggy all by itself. I've had better luck with my Pixel 6 on Android 12 than I did with 11, and I'm newly on Android 13 with my Pixel 6. Things have gotten better with Uconnect with each OS update. I've recently made sure to get the latest Play Store updates which are strangely separate from the phone OS. I'd recommend getting your phone fully up to date.
Right now, I'm on 17.99 in the Durango, Android 13 with the September 2022 security patch, and the August Play system update. I'm waiting to get the September play system update right now. Once you have the phone OS and play system updated, a BUNCH of updates for all your apps will show up as well. Make sure to get all of those as well. My luck has been pretty good with this combination so far. Maybe it will help you too.