Audio in user Video AI interface?

Hi. I’m a newbie with Video AI. When scrolling through a source video, I don’t hear any audio through my headphones (using a FocusRite 2i2). Audio works fine with several other apps (Safari, Camtasia, Davinci Resolve, etc.).

I can’t find any way of setting Audio to the FocusRite 2i2. Is this normal? If audio in the interface should occur, how can I set the output?