Allo DigiOne board

Hi @allo.com @ALLO_audio_boards

I have problems to get the combination of Isolator and DigiOne to work.

I use a Raspberry Pi 3. Pi + Digione is working fine. When adding the Isolator in between the DigiOne is powered (led light is on) but is not recognized!

Pi is powered by an IFI iPower 5V psu,
Isolator is powered by an IFI iPower 9V and is in slave mode. First i power the Isolator then the Pi.

What am I doing wrong?