In order to request an SSL certificate and verify that you own a specific public IP address, Domain Control Validation (DCV) must be performed on every IP address .

IP address DCV can only be completed by using HTTP/HTTPS CSR Hash method.

DCV Emails or DNS CNAME records are not accepted for IP address DCV.

If additional information on performing DCV using HTTP/HTTPS CSR Hash, please refer to the section of HTTP/HTTPS in the following article:
https://sectigo.com/knowledge-base/detail/Domain-Control-Validation-DCV-Methods/kA01N000000brbt