High quality mic on external usb-soundcard dosen't work with Adobe Connect. Why?

Hello

A friend of mine bought a quite good microphone and a good extrernal soundcard for recording podcasts. Everything works fine. But know she wants to use the microphone for Adobe Connect, because of the very good sound quality. Adobe Connect finds it an you can select it, but now singal comes into Adobe Connect. But it works with every other Adobe application. So why doesn't it work with Adobe Connect?

The soundcard is the Tascam US-122 Mk2. Normaly very uncomplicated ..

Thanks for any advice!

Alinja