Is your controller showing connected to input mapper? On top left corner it will show battery level
Try scptoolkit for your controller install the ps4 driver then select wireless controller and install. I'm actually using it today its working more reliable than input mapper. Have it plugged into USB when you install scp.
You have to go to OPTIONS > GENERAL > and there you can choose the controller. You MUST do it BEFORE you join a match or a lobby. It locks your control setting ( Mouse/KB or Controller) before you join a match or lobby.