Moodle course sections are created with a 'hidden' status. Course instructors need to open courses for students to be able to access the course or receive course announcements. This is because students are added to courses 28 days prior to the official start date of your course. As most courses are not ready for student viewing 28 days prior to the official start date, students cannot see the course until the 'hidden' status has been changed.
If you need any help opening your course, please contact email@example.com