I think the real issue is "What's your enrollment method?"
We upload our users in bulk. So, we set "Course enrollable" to No, and that prevents strangers from wandering into classrooms where they don't belong. It won't stop them from seeing links to classrooms, but, hey, all the doors but one are locked.
With courses unenrollable, you simply go into the student teacher's classroom and add the prof manually.
Roles and permissions
Restrict a user to only one course
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