CI2+ with t.bone SC400 (microphone)

my ci2+ does not work with the microphone SC 400 from t.bone (condenser), there is no sound (Phantom power is on, full gain). The microphone works well with other devices (i.e. the Boss RC-30 looper) and another microphone (condenser) works wll with the ci2+. What could be the reason for this?
Regards, Jens