If you need to review your students' Coding Labs code for
practice or unsubmitted assignments, you can ask them to either add you as a contributor
in GitHub or download their workspace as a .zip file and share it with you.
Resolution
Tell students which method of sharing code you prefer and ask them to use the instructions at Instructor Can't View Your Code.
If you prefer students add you as a GitHub collaborator, be sure to give them your GitHub username.