Pixel 8 Pro - No notifications for Messages on Android Auto

[ArtieTheOneManParty]

I've had my 8 Pro for a year or two, and somewhere along the line, I stopped getting message notifications in Android Auto. One of my cars only had bluetooth, and the messages would pop up, but eventually those stopped too (2016 Toyota). I have connected using Android Auto on 5 different vehicles, from 3 different brands (Ford, VW, and Toyota), and in all cases, I don't get notifications for the Messages app (standard text messages). I do get calendar notifications and Facebook Messenger notifications, just not Messages. I've checked all the permissions, re-paired, etc. to no avail. I'm trying to avoid a factory reset on my phone, but I will do it if I have to.

Any ideas? TIA...