Log-in as admin in your local site Go to Site administration > Plugins >Authentication > Manage authentication and Enable the "E-mail based self-registration" plugin, in the same page scroll down to "Self registration " to set there "E-mail based self-registration" Now, log-out and open again your Moodle site in the browser and via the login page "Create new account" button create a new user account using a correct email address you have access to(please, annotate the username and password you used) You should receive a new account confirmation email, please, ignore it. Open a terminal, an execute the following command replacing username and password with the values you just annotated. Remember to replace your site URL too curl 'http://localhost/m/stable_master/lib/ajax/service.php' --data-binary ' [{"index":0,"methodname":"core_auth_resend_confirmation_email","args":{"username": "studentjuan", "password": "moodle"}}] ' | python -m "json.tool" Confirm that: the data->status field from the response is set to true You received again the confirmation email Execute again the CURL request and check that now you receive an exception->errorcode alreadyconfirmed Now, replace the password with an invalid one, execute the curl request an check that exception->errorcode is invalidlogin