Note: Test on Chrome, Edge or Firefox. Safari blocks 3rd party cookies and isn't yet supported in the tool. Prerequisites You need two Moodle sites - one called 'platform' and one called 'tool': In the tool site admin settings: Enable enrol_lti and auth_lti plugins Enable "Allow frame embedding" Make both sites public, HTTPS sites using something like ngrok, localtunnel, expose, etc. Each MUST have a distinct domain to ensure we hit cross-site checks, so you may need to use 2 different tools Course setup Login to the tool site as the admin Create a course called 'tool course' Create an assignment in 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 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 Site admin > Development > Debugging and set debug messages to "None". If we don't do this, we'll hit MDL-80674 . 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 Tool Site" "Tool configuration usage" to "Show in activity chooser and as a preconfigured tool" Save the form Test creating a resource link and launching Login to the platform site Go to the course Click to create an activity or resource Select the "Moodle Tool Site" activity tile When you're taken to the edit form, click the "Select content" button In the popup, verify : You see a view containing the "Use existing account" card Since you're not logged in, you see a "Log in" button at the bottom Click the login button Proceed to login to the site Verify you're taken back to the previous view, but can now see "Link this account" presented as a button at the bottom. Click the button to link the account, and proceed through any success notifications Verify you see a list of activities without errors Click the "Add to course" checkbox for the assignment and click "Add content" Verify the modal closes and you see the edit form, now updated with the assignment name Click "Save and return to course" Click the assignment you just created to launch the tool Verify you're taken to the assignment, inside a frame, and there are no errors on the page. Now, edit the activity settings again Again, click "Select content" Verify you're logged in and can see a list of published activities.