One or more actions are not bound to a key

Help - I am playing the Master Chief Collection on my PC using keyboard and mouse, I am trying to play Halo 3 ODST. As I am left handed I need to change my movement controls from WSAD to the up, down, left and right arrows on the right of my keyboard, but when I try I get “One or more actions are not bound to a key”. I have tried resetting to the default settings, and have go on line to try what others have recommended, but no matter what I try it does not fix it. Have the game makers got a fix for this, they must know about it.
Ray

Hey there!
I had this same issue when I was testing and gathering information for a support ticket and it’s an easy fix you’ll be on your way in no time.
For me the issue was when I changed the Button to open chat to test something I received your error message BECAUSE I was only changing it in one game title Halo 3 which I had not noticed. There’s a toggle to switch what game you’d like to alter the keybindings for.

hope it helped let me know