I bought this mouse primarily for use with the game Borderlands 3. Of course I'll use it for other application but this is the first one I tried to configure.

I cannot configure a number of the buttons to work with Borderlands:
the far left button
the horizontal scroll wheel
the two buttons below the horizontal scroll wheel
the button under the vertical scroll wheel

the Primary, Secondary buttons and the vertical scroll wheel and button can be configured to the game. It is not possible to use the other buttons at all.

Am I missing something?