Domain Name System Security Extensions (DNSSEC) is a security protocol that signs DNS resources and verifies they have not been altered in any way.
DNSSEC is optional and may not be configured on your server. However, if DNSSEC is enabled, a Certificate Authority (CA) must validate it through a chain of trust before they can issue any certificates for your domain.
Our support team is not able to troubleshoot DNSSEC issues. We recommend consulting your server/system administrator or DNS provider for help resolving misconfigured DNSSEC settings.
Read more: Sectigo Reference Guide: DNSSEC and Certificate Issuance