Help! super newb here - Laser won't cut anything

Hi everyone, I’m so sorry for asking what I’m sure is a silly question, but why won’t my laser make any marks at all?

I have a 20w fibre laser, and I had previously been able to use it to do the focal length test and was able to engrave some aluminum business cards. Now I’m trying to do a materials test, but no matter what settings I choose, and despite trying 100% power, I can’t get the laser to even make a simple mark on a piece of paper (let alone metal)

What on earth am I missing to get this to start cutting?

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