Hi!
Interesting! I wonder a student has a quiz open. Could you submit the quiz on the student's behalf? In the Quiz details, find Moderate Quiz, then see if there are any quizzes that are in-progress. Once those are "closed", I wonder if you'll then be able to add the 0 you need. How do I moderate a student's assessment attempt i... - Canvas Community
Alternatively, I wonder if the Quiz has been assigned to all of these students. Double-check that too. If it's not assigned, no score can be entered. How do I assign a quiz to an individual student? - Canvas Community
After exploring those options, please reply! The Community can continue to troubleshoot with you.
