take it back to the dealer and get them to re synch the tpm's to the bike, when they do this they will be able to know if the sensor is reacting or not. the sensors are very easily damaged when changing tyres, especially if the tyre fitter isn't aware of them or know where they are.
if the decals have been removed from the wheel to inform, on the scoots they are opposite the tyre valve, this is different from the bikes as they are part of the valve.