I am an instructor on canvas.instructure.com (free version) and my student has already successfully logged onto one of our organization's courses. She is using the same email and link, but can't get back on the course all of the sudden. She recently received an Access Denied error that specifies, "The enrollment link you used appears to no longer be valid. Please contact the course instructor to make sure you're still correctly enrolled." When I go to the course and look at the people tab, she's using the same information as before. I am lost as to how to advise her.