PSO2 doesn't see my extra keyboard or mouse buttons

I'd like to remap some of my controls but PSO2 doesn't see my extra mouse keys. Is there a trick to getting it to recognize these keys? I'm trying to remap my weapon action to a button above my scroll wheel so I don't keep accidentally scrolling through palettes when I'm trying to do a weapon action but when I hit the button it doesn't show as registering the key.

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I have this same issue