Hello, When I plug a USB 2 Key in any of the back of the docking Station, nothing happen. If I plug a USB 3 in any of them they all open. I think there is 3 USB 3 and 2 USB 2 on the docking station, why any of them open my USB 2 key? They all work on the side plug of the Surface 3 itself. Thank you for your help.