I had this and if you search within the forum you will find my entry for it. Essentially the batteries had reduced in charge on all Kessy keyfobs and the system got confused as to which key was in use so set a flag within the controller which stopped the seats and mirrors moving.
The dealer, after a lot of head scratching, worked this out. Take all three key fobs with you, get them to replace the batteries and then the dealer should be able to reset whatever flag was unset. This will bring the seat/mirror module back into use. I did find afterwards that the foot operated boot closing override has disappeared from the menu and may or may not be related. I never used that override so not too bothered.
Of course the dealer may find it is something else but that is my experience.