Xbox One Elite Controller Button Mapping Problem

I have no idea TBH, but have you tried also mapping the D-Pad left to the Y button as well as the y button to the d=Pad left button? (ie map both buttons so they are all mapped)

The paddles on the Elite controller can only be mapped through the Xbox Accessories app on the Xbox One or Windows 10, otherwise they default to ABXY. They are mapped through the controller itself, you press a paddle on the controller, the controller then
sends the mapped command to the PC/Console. Thus they can only be mapped to duplicate other buttons on the controller and cannot be mapped to commands that are "outside" of the regular Xbox Controller inputs.

Basically they aren't an extra 4 buttons, rather an alternative 4 buttons.

Also, if they are not responding at all, try double tapping the sync button on the top of the controller. When turning the paddles off, you get 4 short bursts of vibration, when turning the paddles on, you get one longer burst of vibration.

Strange as it does state the controller has rubberised grips.

https://www.xbox.com/xbox-one/accessories/controllers/elite-wireless-controller-white

Xbox Elite Wireless Controller – White Special Edition

Interchangeable parts I Hair trigger locks I Rubberised diamond grip I Button mapping

Probably one of the biggest gain you will get from the elite controller is mapping the front buttons to the paddles on the back of the controller meaning no need to release the thumb sticks when you have to press other buttons on the controller.

Are you using a regular controller or an Elite controller. You can have two different button mapping profiles on the elite and switch between them with the switch on the controller.

I don't think the triggers can be re-mapped because they are pressure sensitive.