Users who have upgraded their Apple devices to iOS 9 are unable to launch Secure Apps. The apps appear to be greyed out.

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iOS 8.x and Earlier

If you are running iOS earlier to 9.0 then you can access the apps by trusting the certificate of enterprise app developer.

1. When you first open an enterprise app that you have manually installed, you will see a notification that the developer of the app is not trusted on your device.
2. You can dismiss this message but you cannot open the app. After dismissing this message you can establish trust for this app developer.
3. Tap Settings > General > Profiles or Profiles & Device Management. You then see a a profile for the developer under the Enterprise App heading.
4. Tap the profile to establish trust for this developer. You are then prompted to confirm your choice.
5. Once you trust this profile, you can manually install other apps from the same developer and open them immediately.
6. This developer remains trusted until you use the Delete App button to remove all apps from the developer.
7. An Internet connection is required to verify the app developer's certificate when establishing trust.
8. If you are behind a firewall, make sure it is configured to allow connections to https://ppq.apple.com.
9. If you are not connected to the Internet when you trust an app, the device displays "Not Verified" instead. In order to use the app, you need to connect to the Internet, and tap the Verify App button.

iOS 9.2.x and Later

If you are running iOS 9.2.x and later, then complete the following procedure based on the XenMobile version:

XenMobile Device Manager 9.0

Note: Backup or take a snapshot of the XenMobile Device Manager server and the associated database instance before proceeding with this procedure.

1. Ensure iOS devices are on iOS 9.x or higher.
2. Set or add ios.mdm.cleanUninstalledApps.disable to TRUE in EWPROPERTY table by executing the following SQL query (syntax may differ based on database vendor):
   INSERT INTO dbo.EWPROPERTY(Name, VALUE) VALUES ('ios.mdm.cleanUninstalledApps.disable','TRUE')

XenMobile Server 10.x

Note: Backup or take a snapshot of the XenMobile server and the associated database instance before proceeding with this procedure.

1. Ensure iOS devices are on iOS 9.x or higher.
2. Add a custom property ios.mdm.cleanUninstalledApps.disable with value TRUE in server properties. If property is already added, set its value to TRUE.
3. Reboot the XenMobile server.

When user clicks on Secure Apps to launch them, an error message pops-up saying “Untrusted Enterprise Developer” and user cannot launch Secure Apps.

Refer to https://support.apple.com/en-us/HT204460 for a workaround to suppress the notifications.