mod/feedback/show nonrespondents
From MoodleDocs
This page shows a list of users that did not respond to your feedback yet.
If this page returns all the users of your site, you have found an upgrade bug. Please check https://tracker.moodle.org/browse/MDL-29443?jql=text%20~%20%22feedback%20Show%20non-respondents%22
Following procedure solves this:
- Site administration -> Users -> Permissions -> Define roles - Then go to the Authenticated user and edit this role. - Remove the tick from "Complete a feedback".