Please forgive the boldness of the following ... but it's important! ;)
Please make sure that you've entered your name exactly as it appears on the official course roster - Click the "Back" button to check. Any deveations whatsoever from the roster (even a "Jim" if you're registered as "James") will result in denial of access. Therefore, check your official record on your university's website (such as your course schedule) before submitting this request.
And please be aware that, as stated in the course syllabus and here, on the LMR.org website, technology issues (such as missed assigments or announcements) never excuse course policy. So ... you might want to click the "back" button and double-check your name.