“Feature” on 2017+ BMWs.
Carplay has a list of features, each manufacturer is free to choose what they want to enable or disable. This is one of those.
edit: fwiw,few manufacturers have this, all 2017+
So it’s def possible, at least on F series BMW cause I remember playing with it before. Not sure if it’s available for the Supra tho but what you’re looking is two things:
1) head unit > acoustical confirmation > inactive.
2) roof function center/alarm system > acoustical lock/unlock...
Sounds like good ol limp mode, it happens, interesting no lights came on. Without a log when it happened, can only guess the cause. I would chalk it up as fluke for now, and worry ab it if it ever happens again.