There are a few possible reasons your Assignment didn’t auto-grade (auto-score):

• Check that every question has points assigned.
  You can verify this in the Editor by clicking any question and looking for the point value indicator on the toolbar.

• Make sure you used auto-graded question types.
  All question types in Classwork.com are auto-graded except Open Answer. Open Answers are great for flexibility, but if you want to take advantage of auto-scoring, be sure to use other question types.

• Confirm that answers are set for all questions.
  Each question type has its own way of setting answers. For example, for a Multiple Choice question, click the bubble for the correct answer. For a Dropdown question, you’ll need to edit the item and enter your list of possible answers.
  If you see this indicator on the left-hand side of the Editor toolbar, it means a question doesn’t have a correct answer set:

Pro Tip: Always preview your Activity before assigning it to students to make sure everything works as intended.