Hello @bratsj58
That view indicates the student took it (albeit submitted an empty quiz) and it is failing to populate their results. However, it also says it is missing and if there are no attempts under moderate - that is strange. Is it locked now to the students due to the "until" assignment date? Have they tried to open this on any other browser or clear their cache and cookies? If all general trouble shooting isn't working, the student did not ever open a single attempt, and it should be open to them via dates/multiple attempts.. you may want to contact Canvas Support directly.
Because of the complexity of the issue, and the concerns for privacy, it would be best if you contacted Canvas Support directly to pinpoint the source of the issue and provide a resolution:
https://community.canvaslms.com/t5/Canvas-Basics-Guide/How-do-I-contact-Canvas-Support/ta-p/389767