I got it to work by using the build from the latest version. See also my other thread about the Pi4. There are some quirks and bugs that need to be reworked, but for a very early build it’s quite functional.
For the current project I don’t need video and the composition was already made in Ableton Live so I chose to write a UDP Ableton Live recorder/player in Python and Max for Live. Works surprisingly well. Hope to use Ossia in a next project though!