E5071B Power Calibration - No GPIB System Controller

Am trying to perform a Power Calibration on an E5071B using a Keysight 82357B USB-GPIB interface.

I have upgraded to IO Libraries 14.2 and upgraded to the "B" version of the interface driver.

All I get is an error that there is no system controller when I try do run the calibration.

If I use the Connection Expert it finds and reports that I indeed have a power meter (437B) at address 13.

How can I make the interface the system controller???

Thanks.

Mark B