Need help with key binding

I am currently trying to make my monster hunter 4U config identical to the monster hunter world pc config, but I am having a problem adding the forward button and backward button as L button and R button respectively as it does not recognize the button. Is there any way to fix this issue?

Also, I would love to see if you guys have any config that is almost as identical as the pc monster hunter, if can please do share it :slight_smile: