If you want to fix the Kia Access app not working, then it is simpler to begin with the fundamentals: install the update on the application, reset your phone, cleanse out the app data/cache (or reinstall), confirm the account/VIN might be connected and your subscription is operating, and confirm your internet. Should it fail again, then it may be that your device is faulty and should get Kia Roadside /Support to investigate your account/server status.