Ensure you have a password policy on your site ('Site administration' > 'Security' > 'Site policies'). Visit the settings for the self enrolment plugin ('Site administration' > 'Plugins' > 'Enrolments' > 'Self enrolment') and ensure 'usepasswordpolicy' and 'requirepassword' are disabled (may want to keep this in another tab as you will be visiting this page again). Visit the 'Enrolment methods' page for a course ('Course administration' > 'Users' > 'Enrolment methods'). Add a 'Self enrolment' instance (if there currently is one delete it first). Set the 'Enrolment key' to '123'. Check that you can add it. Disable it via the eye icon on the 'Enrolment methods' page. Check that you can re-enable it via the eye icon. Visit the settings for the self enrolment plugin and enable 'usepasswordpolicy' and ensure 'requirepassword' is disabled. Edit the 'Self enrolment' instance and set 'Allow existing enrolments' to 'Yes' and leave the 'Enrolment key' as '123' (they should already be like that) and ensure you can save successfully. Disable it via the eye icon on the 'Enrolment methods' page. Check that you can not re-enable the self enrolment instance via the eye icon. Edit the 'Self enrolment' instance and set 'Allow existing enrolments' to 'Yes' and leave the 'Enrolment key' as '123'. Confirm that you get a warning saying the enrolment key does not meet the password policy. Set the 'Enrolment key' value to empty and ensure you can save the form. Disable it via the eye icon on the 'Enrolment methods' page. Check that you can re-enable it via the eye icon. Re-visit the settings for the self enrolment plugin and enable 'requirepassword'. Edit the 'Self enrolment' instance and set 'Allow existing enrolments' to 'Yes' and leave the 'Enrolment key' empty (they should already be like that) and ensure you can save successfully. Re-visit the 'Enrolment methods' page for the course. Disable it via the eye icon on the 'Enrolment methods' page. Check that you can not enable the self enrolment instance via the eye icon. Edit the self enrolment instance. Set 'Allow existing enrolments' to 'Yes' and try to save without an 'Enrolment key' entered. Confirm that you get a warning saying the enrolment key is required. Enter an enrolment key that does not match the password policy. Confirm that you get a warning saying the enrolment key does not meet the password policy. Enter an enrolment key that does fit it and confirm you can save successfully. Edit the self enrolment instance. Set the 'Allow existing enrolments' to 'No' and confirm that you can set the 'Enrolment key' to a password that does not meet the criteria and save successfully. Edit the self enrolment instance. Set the 'Allow existing enrolments' to 'No' and confirm that you can set the 'Enrolment key' to empty and save successfully.