So all of a sudden my Note 10 + idnt recognized by Android Auto on the 2018 MDX. I get message "To use Android Auto, please stop the car and follow instructions on your phone". My wife's S10+ works just fine. I can do bluetooth but not via USB. Help!

 

My S10 did that too.I am guessing there was an update to the android auto program.Follow the instructions and sign in to android auto on the phone and it will work again.

 

Followed your lead and undid the updates via the AA app (3 dots in top right of the app) in systems. Reconnected the device to the MDX via USB and it re-installed the app on the device. All is good now. It's working again! Thanks!