error/moodle/nologinas
From MoodleDocs
You have no sufficient permissions to "Login as" the user you are trying to loginas.
Note: You are currently viewing documentation for Moodle 3.7. Up-to-date documentation for the latest stable version of Moodle may be available here: error/moodle/nologinas.
You have no sufficient permissions to "Login as" the user you are trying to loginas.