WCU-4 not recognizing 2+ cforce mini motors

HI,

I'm having an issue with the WCU-4 not recognizing that I have multiple cforce mini motors hooked up to the UMC-4 (or Alexa mini). When I boot up the system I'm prompted to calibrate both motors, however only the focus motor will calibrate completely - whichever motor I have assigned to Iris or Zoom (doesn't matter which one) flashes after calibration, which from the manual indicates that "Motor is calibrated, but no motor master available (idle)".I have both daisy chained together, and have even tried adding the LBUS to DTAP power cable (for the cforce plus motor) to provide extra power. When I look on the WCU-4 screen it doesn't even give the option to select the second motor (iris or zoom) to calibrate it. What is going wrong that the one motor is staying idle?

Please help.

I did not find the right solution from the internet.

References:
www.arri.com/forum/viewtopic.php?f=74&t=492
Motion graphics video animation service

Thanks!