When running emacs under a graphical desktop environment, the DE uses certain keybindings for its own purposes (maximizing/minimizing/moving windows, manipulating desktops, etc.). If you try to use such a keybinding in your emacs, the DE intercepts it, and Emacs will never see it.
If you really, really want to use that keybinding in Emacs, the only way to do it is to convince the DE to not intercept it. How to do that varies by DE, but there is usually some sort of a
Settings app, where you can (re)configure such keybindings.
E.g. in my Gnome environment, the Settings app has a
Keyboard Shortcuts tab where (some) such things can be configured. Other DEs will have different methods, so YMWV.