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By default you will get Mono Audio into the device, meaning you cannot use the Left and Right outputs of your device. To adjust this you need to chance the device settings in the Recording Devices Menu; 

Win 10 1703 and older
Right click the sound Icon in the task bar and go "Recording Devices". Right click the device and go to Properties > Advances and change the "Default Format option" to a 2 Channel device (Bit rate and Sample Rate will depend on your needs)
 
Win 10 1803 and newer
Right click the Sound Icon and go to "Open Sound Settings". Scroll down the Page and Select "Sound Control Panel".
Right click the device and go to Properties > Advances and change the "Default Format option" to a 2 Channel device (Bit rate and Sample Rate will depend on your needs).

Once configured as above you will be able to use your interface as a Stereo device.