Due to internal errors on the game engine, UserEngagement does not work when deep link (URL Scheme) is running on iOS build with Unreal Engine. It should be fixed manually before installation version applies this issue. Refer to the following codes, add to Engine/Source/Runtime/Core/Private/IOS/IOSAppDelegate.cpp, and IOSAppDelegate.h file. Then, UserEngagement runs on iOS environment even when executing deep link. The sample code is based on Unreal Engine v4.17. Make sure to check the line numbers before applying the codes to your game if you develop with the engine lower than v4.17. 
| 