[Tutorial] UE4 using Dualshock4 controller (via USB, PS4 DS4 Gamepad)

Hi folks,
Thanks for all the great info sharing here. For some reason, the minute I play the game, the character will run forwards and to the right ignoring any controller input. In fact there is no input form controller whatsoever. Am I doing something wrong here?
I checked the Vendor & Product ID and they are the same as you guys mentioned.
The controller is definitely plugged in and Windows can read the movements. Furthermore, the controller works fine when I use DS Windows App btw.