Unfortunately you will have to go to the service center and get them re programmed.. this happened to me as well.. no appointment needed just swing by and they’ll do it for you.. a mobile tech could also fix them
This happened to me with one of my fobs. I could never get it to work placing the fob in the recommended places to open the door or start the car. I eventually figured out that in my case, removing and reinserting the battery on the fob cleared up the problem until the next time the fob flaked out. I still got it replaced for free.