If grade passback isn't happening in your course, this may be because your learners have not yet clicked the graded assignment link to Yellowdig on your course page. To configure grading, please advise your learners to click on the graded assignment link to Yellowdig, which should appear in your course's Assignments or Modules tab. They must click on the graded assignments link (not the sidebar link-- unless you're using Canvas 1.3) at least once to configure grade passback.
Set up a graded assignment link in your course (only create one per course): find the help article here for your LMS.
You can also share this guide to grade configuration with your learners.
We hope that helps! If problems persist, or if you're unsure how to proceed, please reach out to us here.