@silvio Thank you for your response. Find a "paste" of the output.
- The following errors were reported by the server:
Detail: Invalid response from
<html class="error-page" xmlns="http://www.w3.org/1999/xhtml"
xml:lang="en-gb" lang="en-gb" dir="ltr">
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.
I don't know if there is a permission issue as I guess, it will attempt to create the .well-known/acme-challenge folder on the server.