Hi @ Ryan Petitfils,
I did some research in background about your issue few hours ago. Typically, when you access MATLAB Grader through grader.mathworks.com, you may not see the course or students enrolled directly because the primary interface for managing assignments and student progress remains within Canvas itself. The integration is designed to streamline the workflow for instructors by providing a centralized location (Canvas) for course management while leveraging MATLAB Grader's assessment capabilities. To view student progress reports and assignments from MATLAB Grader within Canvas, you should continue using the Canvas interface as you have been doing. So, by clickg on individual assignments within Canvas, you can access detailed reports and track student performance effectively. This method ensures that all data related to assignments, grades, and student submissions are consolidated within the Canvas environment for easy access and management. Besides this information, for future reference, this article may help you as well.
Hope this helps. If the following issues still persist, I would suggest contact
https://www.mathworks.com/support/contact_us.html
Please let me know if you have any further questions.