Prerequisites You need two Moodle sites (localhost is fine) - one called 'platform' and one called 'tool' In the tool site admin settings: Enable enrol_lti and auth_lti plugins Enable "Allow frame embedding" In BOTH sites: Go to "Administration > Security > HTTP security" and clear all values from the 'curlsecurityblockedhosts' admin setting and save. (to permit localhost-to-localhost calls) Testing registration Login to the tool site as the admin user Go to Admin > Plugins > Enrolment plugins > Publish as LTI tool > Tool registration Click to create a new registration Name the registration "platform site" and continue You'll see a dynamic registration URL. Click the "Copy to clipboard" icon to copy it Now, in another browser tab, login as the admin user to the platform site Go to Admin > Plugins > Activities > External tool > Manage tools Paste the URL value into the "Tool URL" field Click "Add LTI Advantage" Check the web server logs for the platform site. Verify you don't see anything like the following warning: PHP Warning: Undefined property: stdClass::$id in /home/jake/moodledata/s402/moodle/mod/lti/openid-registration.php on line 55