Ok, so the PTHD card is on the secondary port. The 32 channels will be divided between HD I/O 3 and HD I/O 4.
Yes, the FX Chain I/O needs to be configured to received the audio from the PTHD card.
In my image below, I have Dante 1-2 as the FX chain input/output. You will need to configure your FX Chain to use PTHD inputs/outputs 1-2. Then you will use a Pro Tools hardware insert on C 1/2 to send/receive audio to and from the FX chain. It looks like you have named this hardware insert “EVPT 1”
Please try this and confirm that you can send audio to/from the H9000 on this stereo pair. Once you have that working, you can add the additional channels.
