I searched but couldn't find anything to address this.
I have created a quizzes.next quiz with unlimited attempts, keep the highest score options. The assignment is past due. Students who have completed the quiz are receiving a score of 0 in the Canvas gradebook regardless of how well they do on the quiz. They can see their actual score within quizzes.next, and I can see all of their information as well; the stats are all populating just fine internally. But the information does not seem to be reaching the Canvas gradebook at all.