Learners are able to withdraw from courses under a required specialization

Summary:

We are only assigning specialization as required assignment and courses are required activities under it. Neither we assigned courses and nor learners enrolled themselves as voluntary assignment. But when specialization assigned as required learning and learner enroll into it and then into courses, courses became self enrolled assignments. Which is a unexpected behavior.

Even at course default level we marked No access to course via self service.

Please let us know how to make course required so that learners can't withdraw from courses under specialization.

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