Yes the normal M122 should be reporting the Duex and the drivers, which it appears to not be doing. It is connected, right?
Please try updating your firmware to 3.3 by uploading this zip file to the system tab in DWC and then check M122 again.
https://github.com/Duet3D/RepRapFirmware/releases/download/3.3/Duet2and3Firmware-3.3.zip