[4.6] Multiple Controller Input on Start

My game uses inputs from 4 gamepad controllers. When the game starts up in a build or in a new editor window it is automatically able to receive input from the first controller. However, input does not work for the other controllers until I click inside the window. Is there any way to automatically receive input from the other controllers on start without having to click inside the window?

Figured it out! I just had to use the Set Focus to Game Viewport node.