Access Denied for Outlook Integrator Enrolled Class

Hello,

When a user enrolls in a class, they receive a calendar invite with the time/date, and in the body of the calendar invite it gives the following message:

"You're enrolled in an instructor-led training event that's part of the ***CLASS NAME*** course enrollment."

The class name is a link I think is supposed to take them to the enrollment details, however when the user's click the link they get to a page that says "You don't have permission to access this learning." (Screen Shot Attached)

They are enrolled in the class, so why do they get this message?