1. Ensure that the correct courses are assigned to the right students.

Check for the following:

• Correct spelling of usernames and emails for each student.
• Ensure that the proper courses are assigned to each student.

2. Confirm that the invitations and enrollments have gone through in the correct way.

Check for the following:

• The invitation email has been sent to the correct student/class.
• The student has accepted the invitation to come to the course.
• The student has completed enrollment in the correct course.

3. If necessary, delete the class and create it again to ensure everyone is in the correct enrollment class.