Is your game started off one of their demos like the top down demo?
For some stupid reason(they need to fix this) their top down demo and others that use mouse control have their player controller set to ignore keyboard input. It took me a good 4 hours to figure it out searching online.
Under the defaults for the player controller there should be an option to fix this. I cant remember the exact name but its something like “Block Keyboard Input” and its checked. Uncheck it and try and i bet your F key will trigger properly.