I have found a few information about CourseTalk. Most of it is about having this feature unvisible.
In some forums, it is said that adding the
course_experience.show_reviews_tool flag in Waffle -> Flags in the Django Admin site and enabling it for everyone would make CourseTalk to appear.
However, it is also said that CourseTalk is replaced by Course Experience.
If you need additional help, I recommend you to ask in the official forums, since it seems a question that the EdX support team will help with.
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