dj_discourse_sso/ext_localconf.php

<?php
if (defined('TYPO3_MODE') === false) {
    die('Access denied.');
}


\TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin(
    'Jahnke.'.$_EXTKEY,
    'Sso',
    array('Sso' => 'authenticate'),
    array('Sso' => 'authenticate'),
    \TYPO3\CMS\Extbase\Utility\ExtensionUtility::PLUGIN_TYPE_PLUGIN
);