Email with following content is received:
Could not secure domains of johndoe (login jdoe) with Let`s Encrypt certificates. Please log in to Plesk and secure the domains listed below manually.
Securing of the following domains has failed:
Invalid response from https://acme-v02.api.letsencrypt.org/acme/authz-v3/1234567.
Detail: No valid IP addresses found for sub.example.com
No domains have passed validation
Domain sub.example.com is not accessible with webbrowser
External DNS Server is used
sub.example.com has no A type DNS record.
If the domain is not hosted on the Plesk server, delete the subdomain in Plesk.
Alternatively, set up A record for it in external DNS server.