Why wont the factory alarm disarm

Hello, Your key is not communicating with the vehicle. Either the key is bad, or the ignition switch/key reader is faulty. Try unlocking the doors with the key, then try to start. Same problem? Use the spare key, if there is one. Same problem? A mobile locksmith, or a local shop will help you best. Let me know if you have other questions, otherwise, here is a list of certified shops for your convenience. http://repairpal.com/dodge-within-10-miles-of-shubuta-mississippi-39360