Could you please post your logs from /var/log/letsencrypt? Also, do you have the specific output messages that you saw when running the certbot --nginx command?
AHA! The log states: MisconfigurationError: Cannot find a VirtualHost matching domain nomjk.com. I assume I have to set that up first. I have nomjk.com working on a development machine and should have ported that over first to this box before trying for the cert. But, the output from certbot --nginx was: “Your account credentials have been saved in your Certbot configuration directory at /etc/letsencrypt…” with no mention of any error so yes, I was confused. I will set up nomjk.com on this box, rerun certbot and watch the logs this time. Thanks for your reply.