Prerequisites

1. You need two Moodle sites (localhost is fine) - one called 'platform' and one called 'tool'
2. In the tool site admin settings:
   • Enable enrol_lti and auth_lti plugins
   • Enable "Allow frame embedding"
3. 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)

Steps to reproduce

1. Login to the tool site as the admin user
2. Go to Admin > Plugins > Enrolment plugins > Publish as LTI tool > Tool registration
3. Click to create a new registration
4. Name the registration "platform site" and continue
5. You'll see a dynamic registration URL. Click the "Copy to clipboard" icon to copy it
6. Now, in another browser tab, login as the admin user to the platform site
7. Go to Admin > Plugins > Activities > External tool > Manage tools
8. Paste the URL value into the "Tool URL" field
9. Click "Add LTI Advantage"

Expected result

You should see a tool card now with a button to "Activate" it.

Current result

The following exception is thrown: Attempt to read property "client_id" on null:

Testing instructions have been copied from MDL-78219.