If a key is unresponsive, please perform the keyboard reset, it might help eliminate the problem.

With the keyboard plugged in: 

1. Locate the reset hole on the underside of the keyboard (below the keyboard feet) 

2. Use a pin and hold in the hole for 10+ seconds. 

3. Observe the keyboard RGB flashing, and wait for the reset to complete.

Run the OP as Admin and this should fix the issue. If FW number is different, please uninstall the OP software, download it again from https://fnatic.com/gear/en/op/, install it and run it as Admin. 

Dust, dirt, hair, and other debris can fall into your keyboard and obstruct a key's movement or interfere with its circuitry. Try removing the key that isn't working and clean the area under and around it.

You can also use a different keycap to try it out on the problematic key switch and see if the issue remains. 

If it does, do not hesitate to contact us on shop@fnatic.com along with the video recording of the problem, your order ID and serial number for the keyboard.