byte[] array = new byte[] { 0x01, 0xC4, 0x01, 0x00 }; - sending this byte array does not activate gamepad B
Using similar byte array message for moveDown (VK_GAMEPAD_DPAD_DOWN | 0xCC) works as expected.
Reference - https://docs.microsoft.com/en-us/windows/uwp/xbox-apps/uwp-remoteinput-api