MCA100 not working with Voicelive Play

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The Voicelive Play does not react at all to the MCA 100.  I have set up the VP for the correct mic type and have verified with a multimeter that the XLR cable is fine and the 48 V phantom power is present (the button lights up.).  I have also downloaded and installed the latest firmware for the VP.  I have tried with all of the modes: Hit; Hit/Talk and preset up; nothing works.  Is there something else to try, or is the MCA 100 just defective?