Certbot via Ubuntu 20.04 terminal having DNS challenge failed for LOCALLY HOSTED domain

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H00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
VirtualHost configuration:
*:80                   nextcloud.martekservers.com (/etc/apache2/sites-enabled/000-default.conf:1)
*:443                  nextcloud.martekservers.com (/etc/apache2/sites-enabled/nextcloud-ssl.conf:2)

Note: Weird that it says it can't reliably determine the server's FQDN. I thought I had done everything correctly up to this point.