Students cannot see their registered courses in Brightspace until the first day of classes for the semester unless the instructor changes the availability dates to an earlier date.
Your official registrations can be viewed in Bu Brain. If you are registered for the class in BU Brain and have verified that the instructor has changed the setting of the course so that is available for students, and you still cannot see it in Brightspace, please contact the Help Desk and provide the course ID and section so we can look into it further.