Whenever I press the FN key, the function keys don't work

[YellowM]

My function keys on my USB keyboard don't work whenever I press "fn". e.g I can press F2 to change a file's name and it works just fine, but if I press fn + F2 to lower the volume, it doesn't work, and it's the same for the rest of the function keys, they work all just fine until I press fn+ a function key.Another example is, when I press F1 by itself, it opens my web browser, but if I press fn+F1 it opens the web browser instead of Muting the sound like it used to.I have a Lenovo Legion, these keys work as expected on my laptop's keyboard but they don't on my USB keyboard.Function keys are no

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