Make your site public (e.g. ngrok, etc) Per the docs ( https://docs.moodle.org/402/en/OAuth_2_LinkedIn_service ) go to https://www.linkedin.com/developers/ and create a "Moodle 4.3 dev" app Notice you can't see "Sign in with Linkedin" under products any more Request access / add the product "Sign in with LinkedIn using OpenID Connect" instead Make sure you've set the "Authorized redirect URLs for your app" to: YOURSITE/admin/oauth2callback.php Now, go to your Moodle site Login as admin Go to "Site admin > Plugins > Authentication" and enable the "OAuth2" authentication plugin Go to "Site admin > Server > OAuth 2 Services" Click the "LinkedIn" button Enter your Client ID and Client secret (You'll find these on the 'Auth' tab of your LinkedIn dev portal app Uncheck "Require email verification" (We don't need this for testing) Check the "I understand that disabling email verification can be a security issue" box to confirm Save changes Verify : You see the service has a tick under the "Login" column You see the service has a tick under the "Discovery" column Logout Go to the site login page Verify you see "LinkedIn" listed there as an SSO provider Click the "LinkedIn" SSO icon/button Login to LinkedIn if needed Verify you see an auth request/consent page Click to continue to link the app Verify you're logged in to Moodle View your user profile Verify it contains the details of your LinkedIn account