Let's Encrypt certificate cannot be installed with the following error:
Invalid response from https://acme-v01.api.letsencrypt.org/acme/authz/DEADBEEFMwVU3eZxfBU9-PRUcd51tflRLJD7CoBTxrQ.
Detail: DNS problem: SERVFAIL looking up A for example.com
Error: Could not issue a Let's Encrypt SSL/TLS certificate for example.com. Authorization for the domain failed.
Invalid response from https://acme-v01.api.letsencrypt.org/acme/authz/0VWhDoTjEzzwPXNzPHd-zO73YAdXa8qgyac7eEiPQqY.
Detail: unknownHost :: No valid IP addresses found for example.com
DNS problem: NXDOMAIN looking up A for example.com
- check that a DNS record exists for this domain
A website example.com may be created recently and may be accessible from the web;
Domain name cannot be resolved against some of global DNS resolvers:
# dig example.com @18.104.22.168 +short
A record does not exist or DNS propagation is not completed.
Add A record for a domain.