Quiz wasn't automatically graded in Canvas after student completed quiz

[mgj37]

I created a multiple choice quiz in Canvas but it did not automatically grade the quiz like I thought it would. How would set it up so Canvas can automatically grade the quiz. Currently, I don't see any grades in the grade book after a student has taken their quiz. 

[dirk_vandepol]

I've got the same problem, and I've never had the problem before, after several terms of Canvas use. 
The quiz is all multiple choice, and yet only about 20% of the students' attempts were scored.  The rest seem to be waiting for me to do them manually.