Mission Control Won't Open and How Do you set up control + up arrow to make it work

Hello I'm trying to use the control + up arrow to see my desktops/apps that are open but it's not working. I am on 10.13.6 High Sierra.

I have spaces enabled and for some reason, the mission control won't work. I have tried the "killall Dock" in the terminal but that doesn't work. Please help!


Does it display the correct keyboard shortcut in Mission Control Settings? Try changing the shortcut to something else and then changing it back to your desired shortcut.

Mission Control Settings