When instructors set up a quiz they can set it up to automatically send the quiz grade to the grade book. Sometimes instructors intentionally do not set this up because there are long answer questions that must be graded by hand. They have to grade the long answer questions first before releasing the grade to students.
Some instructors forget to make the right selections for the quiz grade to be entered into the grade book.
Solution: Contact the instructor and let him or her know that the quiz grades are not showing in grades. He or she can then make the necessary changes or contact D2L support for assistance.