Reset quiz to allow retakes

Quizzes are my nemesis. 

I am allowing students to attempt the quiz twice and if they still don't pass I have setup the elearn so after two attempts they have to retake the course. All of that is working what isn't working is after they redo the course and try to retake the quiz it doesn't work, you can't click on any of the answers. So what am I missing???? 

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