There doesn't appear to be a way to limit Collaboration participants to enrollees for a particular course. Adding the Collaboration to a course does allow the user to get to the Collaboration from the course page, but ONLY if the Collaboration is also assigned to them as a user or based on their department. I don't want to have to manually add course enrollees as users of the Collaboration. Could this be added as a "post-enrollment" option? When a user enrolls in a course, also add them as a user to a given Collaboration?
Currently, I've "assigned" the collaboration to the same departments as the course, but not all members of those departments will care at all about the collaboration.