Windows 10: Ctrl-Win-Right shortcut not working

This is key jamming. You'll need to upgrade to a higher-quality keyboard.

• Most keyboards use matrix circuits for keypress detection and cannot detect simultaneous presses of certain combinations of three keys. The specific combinations that cannot be detected depend on the keyboard model. In these situations, the keyboard will not register the keypress. On your keyboard, the matrix as laid out inside your keyboard is unable to handle the Ctrl+Win+Right Arrow combination.

• More expensive keyboards generally have better isolation among keys and do not suffer from such jamming. Generally, any keyboard with some degree of "anti-ghosting" should not suffer from this issue. The best keyboards have "n-key rollover" and can handle any number of simultaneous keypresses; these keyboards are generally very expensive and should not be necessary to address this issue. See: Wikipedia article on keyboard rollover.

Since windows doesn't allow changing keyword shortcuts,
The only option that remains is to map another key on your keyword to WIN key.

I used sharpkeys and re-mapped my RAlt key to WIN key.
Now i can use Ctrl+RAlt+Arrow to move around.

Another option is to use autohotkey.

LCtrl & Left::sendevent {LWin down}{LCtrl down}{Left down}{Lwin up}{LCtrl up}{Left up}
LCtrl & Right::sendevent {LWin down}{LCtrl down}{Right down}{LWin up}{LCtrl up}{Right up}

Create a file with .ahk extention and use the above code.
You will be able to move around with LCtrl + Arrow keys.

I recommend using sharpkeys ( it's much simpler and easier to work with ).

I had this same issue with the Left Ctrl+Windows+ ←/→ combo not switching Virtual Desktops. A workaround that worked for me is using the right Ctrl key on my laptop's keyboard. Right Ctrl+Windows+ ←/→.