UNET Command not working

Iam using a Command to get input from a player to the server but for some reason its not working. According to the documentation a Command is run on the server but you can pass in parameters with values from the client if i understood it correctly. However when i check this it doesnt seem to do anything on the server,

         public void Update()
         {          
         if (!isLocalPlayer) return;
         //Movementinput stuff here.....

         //Sync movement input to the server
         CmdMove(_mouseWorldPosition, _heading);
         }
 
         [Command]
         void CmdMove(Vector2 mousePosition, Vector2 heading)
         {
             _mouseWorldPosition = mousePosition;
             _heading = heading;
         }