If you are unable to see one of your courses in Canvas one of these three things could be causing it:
1. You are not registered for the course (or the registration has not synced through all systems)
Fix: Make sure you are registered for the course and wait up to 24 hours for the sync to occur.
2. Your instructor has not published the course
Fix: Message your instructor to remind them to publish the course so everyone can see the course.
3. The course is over, and the instructor has not allowed for access after the end date.
Fix: Message your instructor and ask them to allow students to view the course after the end date.
(If you are looking for your final grade, it can be found on your unofficial transcript on TigerNet.)