I cannot use Diagonal Press with Motion Stick.

I tried to set the following: 
MRIGHT  * - = LCONTROL 
MLEFT  * - = LSHIFT

This is for quick item stacking and picking up half a stack (I am using a Joy-Con).

After setting it up, pressing the button doesn't work, but it works with Chorded Press: 
MRIGHT , - = LCONTROL 
MLEFT , - = LSHIFT