The command fails with:
root@www:~# sudo certbot reconfigure --cert-name rejuvenatedremnants.com --apache
Saving debug log to /var/log/letsencrypt/letsencrypt.log
An existing certificate with name rejuvenatedremnants.com could not be found. Run certbot certificates to list available certificates.
Ask for help or search for solutions at https://community.letsencrypt.org. See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot with -v for more details.