If you’re using apps signed with an Enterprise profile (under the Apple Developer Enterprise Program), you may have noticed that when you try to open that app in iOS 9, you get a strange warning that says “Untrusted Enterprise Developer: [developer name] has not been trusted on this iPhone/iPad. Until this developer has been trusted, their enterprise apps will not be available for use.”
The solution to this is a little hidden away, so here’s what you need to do to open the app:
1. Go to the iOS Settings App, and tap on the “General” tab:
2. Scroll to the bottom and tap on “Profile” (or “Profiles”):
3. Tap the name of the developer of your app (in this case, “Small Planet Digital, LLC”):
4. Tap “Trust [developer name]”:
5. Tap “Trust” in the dialog that pops up:
6. When you see the sentence “Apps from developer [developer name] are trusted on this iPad and will be trusted until all apps from the developer are deleted,” you’ll know that you’re good to go.
7. Head back to the Home Screen and open your app.