I have several courses that use surveys for course evaluations but learners cannot access them. Interestingly, it's a different issue depending on the course.
In one course, the survey won't load at all and the learner receives the message, "This content item cannot be rendered".
In another course, the learner receives a message that they are not authorized to view the page.
I have verified that the permissions are on for all users to be able to participate in surveys.