If you need to have a particular user’s certificate invalidated, it is an easy process. First go to the Instructor > Certificates tab. From here, just scroll down to the section called Invalidate Certificates.
In the first field you must place the username or email of the user whose certificate needs to be invalidated. There is an optional field to put notes for the instructor’s convenience.
After you have placed the learner’s username or email, press the “Invalidate Certificate” button just below.