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Are you using the Duet with firewire? If you are have you got the drivers of the Duet installed on your PC? If you have it might be your computer is grabbing the soundcard and so the paca won't get it.
It's probably worth glancing over these pages again and checking everything:
https://kyma.symbolicsound.com/configuring-audio-and-midi-interfaces/
https://kyma.symbolicsound.com/configuring-audio-and-midi-interfaces/apogee-interfaces/
https://kyma.symbolicsound.com/connecting-the-hardware/tips-for-achieving-firewire-bliss/