OBS + webcam-capture = "cannot execute task" on Webcam.open()

[i-make-robots]

project source is v2.10.0 of https://github.com/MarginallyClever/Robot-Overlord-App
version: 0.3.12
what I'm doing:

Webcam webcam = Webcam.getDefault();
webcam.open()

if I am running OBS and a camera feed option is available (see pic) and then run the webcam capture method I get a WebcamException.
Can I film the camera feed from OBS and in the java app (top right) also show the camera feed pulled in via your library? Is there some way to get them to play nice together?

Context:
without webcam feed:

without OBS:

Goal is to have camera feed in app while also running OBS to capture full user desktop experience.

PS: Love this library! It is hugely useful and I am very grateful for your work.