Hello there, @jay ...
Since the majority of Canvas Community members would not have access to your course or your school's Canvas environment, it's tough to troubleshoot this. However, is this particular quiz included in one of your modules in your course? And, if so, do you have any prerequisites and/or requirements set for that module that would prevent students from opening the quiz until certain other criteria has been met?
Also, I noticed at the bottom of your quiz that it says the quiz is for "February 2019". This means that you've created a group set in your "People" page called "February 2019". Are there only a select number of students in that particular group set? If so, are the students NOT in that group set the ones who CANNOT access the quiz? If you want all students to access this quiz, then you are going to have to change this to "Everyone" rather than "February 2019".
That's where I would start...and if students are still having difficulties with this, you might want to reach out to the folks at the Canvas Help Desk. How do I get help with Canvas as an instructor?
Hope this helps, Jay.
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