I would verify that you have updated and are using the correct app keys for your dev project. How are you running the app? iOS is set up to detect it's the environment and will default to production or development keys depending on where it is run from (Xcode vs testflight/app store).
Is the process of enabling notifications working properly?
If you want to provide us with the Xcode logs when you launch the app we can take a look and see if anything stands out. I believe you have email support with us so you can fill in this form with all the information or email us at email@example.com.
Urban Airship Technical Support