Occasionally a student will take a quiz or exam but the attempt shows as 'Never Submitted'. If this should happen, the fix is pretty easy. You will need to change the settings until the student starts the new attempt, as explained in the steps below but you can change them back after the student(s) has submitted the "new" attempt (no worries, they do not have to take it over!)
First, click on the quiz and in the Quiz Administration block, click Edit Settings.
Follow the steps below saving your changes.
1. Update the quiz : set the "close the quiz" date after today
2. Set "When time expires" to "There is a grace period .. pick a few minutes."
3. Under Grade set "Attempts allowed" to "unlimited".
4. Question behavior: Each attempt builds on the last "Yes". *
5. Invite the students who did not submit/close their exams to go back to the exam and Re-attempt quiz, and then click Submit all and finish immediately, as shown in the two screenshots below.