UE4 android usb keyboard num pad keys doesn't work


I’ve created an app for Android which needs a USB keyboard. I changed console variables for keyboard and mouse input. However when I try the android app, the regular USB keyboard keys work, but the Numpad keys does not work. When I turned off Num Lock, numpad keys works as arrow keys, but I can not use them as numbers with num lock. Does anyone know the reason?

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