Grub dual boot windows and theming

Hey, I'm having issue with grub and theming
The bigger one is that windows doesn't show up when dual booting and sudo grub2-mkconfig it says
"grub-probe: error: failed to get canonical path of /user"
I also used to theme grub, which I don't know if I can do now since it's immutable
Any chance someone is familiar with all of this?
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