Blackmagic DeckLink Quad 2 capture to disk not working as expected

[puppetisto]

Hi there, 

I am trying to get a camera feed using the capture camera to movie actor from a feed from my DeckLink Quad 2 card. I have a Mac M2 Studio machine. The DeckLink Quad 2 card is mounted in a xMac Studio expansion system and connected to the Mac Studio via thunderbolt. 

When I try the capture stage to movie actor that works as expected and a file is generated / replaced and it works as intended. 

However, part of what I am trying to do is capture the audio, which the capture stage does not do, so I need to use the Capture Camera to Movie actor. When I try using that actor, no file appears even though it looks like it is recording. 

When I switch the camera on the Capture Camera to Movie actor to a USB camera, it works as intended, creating the file with the audio feed as intended.

I have the latest BlackMagic driver and Isadora versions and my system software is updated to the latest version. 

Any ideas what might be wrong or ideas for a work around?