iOS9 Untrusted Enterprise Developer with no option to trust

In iOS 9.1 and lower, go to Settings - General - Profiles - tap on your Profile - tap on Trust button.

In iOS 9.2+ & iOS 11+ go to: Settings - General - Profiles & Device Management - tap on your Profile - tap on Trust button.

In iOS 10+, go to: Settings - General - Device Management - tap on your Profile - tap on Trust button.

Do it like this:

Go to Settings -> General -> Profiles - tap on your Profile - tap on the Trust button.

but iOS10 has a little change,

Users should go to Settings - General - Device Management - tap on your Profile - tap on Trust button.

Reference: iOS10AdaptationTips

For iOS 9 beta 3,4 users. Since the option to view profiles is not viewable do the following from Xcode.

1. Open Xcode 7.
2. Go to window, devices.
3. Select your device.
4. Delete all of the profiles loaded on the device.
5. Delete the old app on your device.
6. Clean and rebuild the app to your device.

On iOS 9.1+ n iOS 9.2+ go to Settings -> General -> Device Management -> press the Profile -> Press Trust.

Changes to Enterprise App Distribution Coming in iOS 9

iOS 9 introduces a new feature to help protect users from installing in-house apps from untrusted sources. While no new app signing or provisioning methods are required, the way your enterprise users manage in-house apps installed on their iOS 9 devices will change.

In-house apps installed using an MDM solution are explicitly trusted and will no longer prompt the user to trust the developer that signed and provisioned the app. If your enterprise app does not use an MDM solution, users who install your app for the first time will be prompted to trust the developer. All users who install your app for the first time will need an internet connection.

Using a new restriction, organizations can limit the apps installed on their devices to the in-house apps that they create. And a new interface in Settings allows users to see all enterprise apps installed from their organization.

Source: Official email sent from [email protected] to existing enterprise app developers.

Device: iPad Mini

OS: iOS 9 Beta 3

App downloaded from: Hockey App

Provisioning profile with Trust issues: Enterprise

In my case, when I navigate to Settings > General > Profiles, I could not see on any Apple provisioning profile. All I could see is a Configuration Profile which is HockeyApp Config.

Here are the steps that I followed:

1. Connect the Device
2. Open Xcode
3. Navigate to Window > Devices
4. Right click on the Device and select Show Provisioning Profiles...
5. Delete your Enterprise provisioning profile. Hit Done.
6. Open HockeyApp. Install your app.
7. Once the app finished installing, go back to Settings>General>Profiles. You should now be able to see your Enterprise provisioning profile.
8. Click Trust

That's it! You're done! You can now go back to your app and open it successfully. Hope this helped. :)