The actual name of the input that correlates with the key must be put in there, not the name of the button on the keyboard if that is the issue. For example, Spacebar is the "Jump" key. So you can add a named key that has the alt button as the key in the
Edit > project settings > input > axes >
then change it to one higher on the "Size" to add another axes and whatever you name the axes you have to put as the key string.
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