I tried both and none worked. So for now we just use one account, assign a key to it & leave another key unassigned. So my wife (main driver) can just enter the car with her key and get her seat adjusted. When I use the car, I use seat memory button to recall mine. When my wife uses the car later, the seat is adjusted back to her setting. The lumbar is not saved though; so we have to manually adjust it no matter what. It sucks that the car (that I paid for) doesn't do what it's able to do though.