Axis Mappings in UE4 does not work using Oculus Rift

Resently I start to learn and use UE4 and Oculus Rift.
I am using UE 4.25 and Oculus VR 1.44.0. My project is attached.

I have a trouble in axis mapping. Here's my settings:


When I press W or S everything is OK. However, none of the Oculus Touch buttons work.

Wearing the Oculus Rift HMD, I can see my hands moving, and the Touch buttons work in other games.
So I think the problem must be caused by UE.

I googled but got nothing. I would be very grateful if somebody could please help me.