The emails are from Samsung and legitimate. Not sure what is going on here. I recently got an Active 2 watch and registered the device but I have no idea why I keep getting these emails. I checked to see all the devices I have registered with Samsung and none of them are unexpected or new except for the watch.
Thank you for reaching out. I would recommend reaching out to our Samsung pay team directly at 1-844-726-7297 for further assistance.