Pending Active Status?

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What causes a learner to be in a "Pending Active" status when adding to an instructor led offering?  I am not entering it any differently, and have received this "pending active" status for two days, as i am trying to add learners..  I have tried to mark activities complete, but it won't change.  I also created a new offering, and am still getting this pending active status.   Any ideas?   Thank you!