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) Course setup Login to the tool site as the admin Create a course called 'tool course' Create an assignment in the course In another tab, login to the platform site as the admin Create a course called 'platform course' LTI 1.3 setup 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 to Admin > Plugins > Activities > External tool > Manage tools Paste the URL value into the "Tool URL" field Click "Add LTI Advantage" You should see a tool card now. Click "Activate" on it. Edit the tool (click the cog) Set: "Name" to "Moodle LTI Advantage" "Tool configuration usage" to "Show in activity chooser and as a preconfigured tool" Save the form Log out of the platform site Now, go back to the tool site as a site admin Go to "Site admin > Plugins > Enrolment plugins > Publish as LTI tool > Tool registration" Edit the registration and go to the "Platform details" tab Edit the details and change "Authentication request URL", adding the suffix '?test'. It should look something like the form: http: //localhost/PLATFORMSITENAME/mod/lti/auth.php?test Save Publish an activity and set up the resource link in the platform Login to the tool site as the admin user Go to the course From the course nav, select "More > Published as LTI tools" Click to publish a new resource Select the assignment in the "Tool to be published" field, leaving everything else alone Save Logout Login to the platform site in the new tab Go to the course Click to create an activity or resource Select the "Moodle LTI Advantage" activity tile When you're taken to the edit form, click "Select content" Click to bind your account with the admin account in the tool Verify you see a list of activities without errors When you see the list of activities, select the assignment's "Add to course" (add to gradebook will be auto checked and that's ok) Click "Add content" When the modal closes, check the "Privacy" section of the form Make sure that all options are checked (accept grades, share names, share email) Save the activity instance Launch the activity instance by clicking it Verify you see the activity in an iframe and that you see no errors. Now, log in to the tool site as an admin user again Go to "Site admin > Plugins > Enrolment plugins > Publish as LTI tool > Tool registration" Edit the registration and go to the "Platform details" tab Edit the details and change "Authentication request URL", removing the suffix '?test'. It should look something like the form: http: //localhost/PLATFORMSITENAME/mod/lti/auth.php Save Now, back in the platform site, repeat the process of launching the tool instance (the activity), Verifying you see no errors