Cannot Remap Weapon Mode on PC Mouse & KB

tried remapping the weapon mode default C to either keyboard T or middle mouse button. it does remap on the interface but the button does not work.

Is another thing already mapped to that? I think T may already be in use.

T is hardcoded to Push-To-Talk. Unfortunatly, the game allows you to bind it to something else, but then it doesn’t work (for me that would be reload, which really annoys mit since release) and doesn’t tell you why.