Just noticed the Reset Default Keyboard Shortcuts should probably be:
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-left "['<Control><Alt>Left']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-right "['<Control><Alt>Right']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-up "['<Control><Alt>Up']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-down "['<Control><Alt>Down']"
gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-left "['<Control><Shift><Alt>Left']"
gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-right "['<Control><Shift><Alt>Right']"
gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-up "['<Control><Shift><Alt>Up']"
gsettings set org.gnome.desktop.wm.keybindings move-to-workspace-down "['<Control><Shift><Alt>Down']"
Just noticed the Reset Default Keyboard Shortcuts should probably be: