When students can’t access a course, most of the time it has to do with enrollment or login issues. However, the way you design a course can also affect student access. Do not make any external tools such as Zoom or Attendance the first item on your course menu, or the landing page or entry point for your course. If you do so, your students will get stuck in an endless loop and not be able to access the rest of the course material!
If this has happened, you can easily fix it by changing your course entry point.
Other reasons students cannot see course material include having them hidden. Use the Student Preview Mode to see what the students' are seeing. You may need to make the course menu available, change the display dates on the content or remove some other restriction.
Changing your course entry point