Why Can't Students See their Courses?
When courses are created on Moodle they are hidden from students. When the course is ready, Teachers need to change the Course visibility to Show the course.
If the breadcrumb at the top of your course is grey and in italics as in the example below, students will not even know the course exists.
To make the course visible to students please do the following:
1) Edit your Course settings
2) Change Course visibility from Hide to Show
3) Then click on the Save and display button