Fatal error: Uncaught Error: Call to undefined function get_client_by_client_id() in /var/www/eintrachtpodcast/wp-content/plugins/oauth2-provider/library/templates/grant-request.php:27 Stack trace: #0 {main} thrown in /var/www/eintrachtpodcast/wp-content/plugins/oauth2-provider/library/templates/grant-request.php on line 27