When I run “sudo certbot –apache -d mydomain.com” the response I get is:

The following errors were reported by the server:

Domain: mydomain.com
Type: connection
Detail: Error getting validation data

To fix these errors, please make sure that your domain name was
entered correctly and the DNS A record(s) for that domain
contain(s) the right IP address. Additionally, please check that
your computer has a publicly routable IP address and that no
firewalls are preventing the server from communicating with the
client. If you’re using the webroot plugin, you should also verify
that you are serving files from the webroot path you provided.

Thanks very much, RD

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Yes. What is the domain?