Did you configure the SMTP settings in the application? In case you didn't or if the extension is not working as expected, I suggest you ask in the community forum of the application to know more information about that error
Regarding this error message, the config.php file is configured to not to be accessible remotely. You can obtain that information from the /opt/bitnami/apps/magento/conf/htaccess.conf file
Happy to help!
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