Razor Naga issue

Hey guys,
I’ve bought another Razor Naga and I’m having a keybinding issue that’s making me pull my hair out!
Ive had this issue before but I can’t for the life of me remember how I fixed it.
So! Anything I try and key bind to Shift+anything on the mouse doesn’t work. Im playing on a laptop without and numeric pad, because I remembered something to do with toggling the num lock used to work but I can’t do that.
Any help would be much appreciated I’ve tried through razor but there not much help.
Thank you so much in advance <3