Apple has modified the security features in iOS 9+, so follow the below steps after installing the app in device.
- Launch Settings from your Home Screen.
- Tap on General.
- Tap on Profiles/Device Management.
- Tap the name of the distributor under the Enterprise App section (iPhone Distribution: FACILITY SOLUTIONS GROUP, INC).
- Tap to trust.
- Tap to confirm.
*You must manually return to your home screen and find the ProT icon, AFTER YOU CLICK INSTALL*.