I posted here a few days ago. Took delivery on my 2021 M3 LR on Friday, heater stopped working on the way home from dealer. Is now in for service. I have now heard of three other 2021 M3 LR with the exact same issue in the group of deliveries now happening in Norway. This seems to indicate some sort of larger issue with how these are being manufactured. If you took delivery on these, I’d keep an eye out for this.