DNS
7 YXRRSET
RR Set Exists when it should not. A resource record set exists that the update prerequisite says should not.
Quando você vê este código
A DNS UPDATE failed because a specific RRset (e.g., an A record) already exists when the prerequisite required it to be absent.
Como corrigir
Delete the conflicting RRset before retrying the update, or adjust your prerequisite conditions to match the actual zone state.