Question about Creative BT-W2 USB Bluetooth transceiver

I use the BT-W2 on a PC with Windows 10 (all updates available). I use a Sony MDR-1000X with it. Pairing and operation work without any problems, but only the output is connected, i.e. listening to audio works, micro does not. If I use the Sony MDR-1000X with my smartphone, everything works. How can I get the two devices to connect as output and input devices?