KMS was unable to publish a DNS record. Whether this is a serious issue or not depends on the abilities and configuration of the Domain Name System at your facility.
Possible causes include:
DNS does not support SRV records or dynamic publishing (DDNS).
The KMS machine does not have permission to update DNS.
The designated DNS domain does not exist or is unreachable.
If your DNS configuration or policies do not permit dynamic SRV publishing, you should disable publishing by using slmgr.vbs -cdns. Verify that the target domain is correct and accessible. If you have specified publishing to multiple domains, verify that the value specified in the registry (DnsDomainPublishList) is correct.