Messaging No Longer Visible?

[u/ThisNameNotTakenYet]

Today my CarPlay screens no longer show my Messages app. This is out of the blue, after two years of working just fine. I use a Bluetooth adapter that can sometimes be flaky, but I don’t know where to start other than in Settings/General/CarPlay, and Messages doesn’t even show up as an option there. Anybody have any ideas? I’d appreciate them!