This is a privacy feature, and only someone set as an ""Instructor"" on a course can see this page and get the data.
If you're set as a "Contributor" on the course, not an "Instructor", you won't be able to access the content on this page.
Currently, the only way to switch a co-author's role on the course is for the Primary Author to remove them as a co-author, and then add them again as a co-author, but this time inviting them to be an Instructor.
The Primary Author can do this on the course's Authors page here:
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