There may be multiple reasons why a student cannot access a published quiz; you might have an Available Until date set, or they might have already used up their allowed attempts.
Courses are automatically published on the Sunday before the course start date.
Some faculty may be wondering if it's possible to directly import content from Blackboard to Canvas.
Canvas does recognize Blackboard course exports and can import them, but in some cases it can be better to copy over content manually.
Faculty often wonder when students will receive notifications from their Canvas course.