A fatal issue occurred during the DNS lookup process for www.deltapubblicitasrlshop.it/CAA.
DNS response for www.deltapubblicitasrlshop.it/CAA did not have an acceptable response code: SERVFAIL
A private, inaccessible, IANA/IETF-reserved IP address was found for www.deltapubblicitasrlshop.it. Let's Encrypt will always fail HTTP validation for any domain that is pointing to an address that is not routable on the internet. You should either remove this address and replace it with a public one or use the DNS validation method instead.
fe80::3a60:77ff:fea3:4854