I followed the instructions line-for-line, including the part about snapd. When I ran the command 'certbot --nginx', I received the following...
blah blah blah
Certbot failed to authenticate some domains (authenticator: nginx). The Certificate Authority reported these problems:
Domain: grollige.com
Type: unauthorized
Detail: Invalid response from http://grollige.com/.well-known/acme-challenge/PBPImD8Oj8G8Kcuz7dfcOsHEkDIFztdvknBBgxHWFYk [208.91.197.27]: "\n\n404 Not Found\n\n
Not Found
\n<p"
Hint: The Certificate Authority failed to verify the temporary nginx configuration changes made by Certbot. Ensure the listed domains point to this nginx server and that it is accessible from the internet.
blah blah blah
It is not required that they both be the same IP but they almost always are. And, if they are different they need a different discussion about getting certs.