I had this issue on my 2022 model X about eight months ago, which was about three or four months after I got it. The mobile technician came over check it out says basically he can’t get more details. Like which seat it is or which location in the car and needs to go to a service center.
I kind of let it slide and it went away. It actually restarted in the last month on and off.
I’m thinking it has something to do with the cold weathers although obviously I cannot be certain.
Will hopefully get taken care of in the next month or two.
I do have a baby seat, strapped to the anchors and not the seatbelt in the backseat. I think the tech at that point said that this may be something to do with this.