The problem is, everything about the completion tracking is turned on (from advanced features, from course, from everywhere), the marks are checked, it is set to visible, enabled in the course, and still when I add restriction, Activity Completion is missing from the menu. It is missing for every element and activity inside every course existing, or a new one. Please help! Thanks.
Version : Moodle 2.9.2 (Build: 20150914)