Students are not authorized to see or participate on Start Here. My course says published. What would be the reason that they cannot log into sign in?
Check the obvious:
Course, section, term start dates
Content start date (if any)
If you don't see anything wrong with the above, I'd suggest contacting your school's Canvas admin to review it, and/or contact Canvas support who can view your class and help diagnose the issue.
Retrieving data ...