Hi @tmorgan210,
Are you running the "User course access log" report? If so, the first and last note of the report description may be pertinent here: "This report shows all the activity from users enrolled in all courses in a given term." "A maximum of one month's data will be retrieved. By default, it will return data from the beginning of the previous week."
Keeping those two notes in mind, the report will only show access form enrolled course-level users, not people with admin access who aren't enrolled i he course. It will also only include a month's worth of data, not an entire term or year. For a fuller picture, you'd likely need to look into Canvas Data, which would give access to almost all data that exists in Canvas, though it is designed mroe for developers/data analysts so may not be the easiest thing to get started with.
Hope this helps a bit!
-Chris