Use Mautic’s world configuration to paste in the DSN details, In particular the API keys and passwords. The values should be URL-encoded, as well as configuration form does that for yourself. If you're pasting DSN settings immediately to the config/regional.php file, it's essential to URL-encode the values on your own. https://mauticupdate91111.mdkblog.com/33703245/the-smart-trick-of-mautic-update-service-that-no-one-is-discussing