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ERROR_CLUSTER_CANT_CREATE_DUP_CLUSTER_NAME
ERROR_CLUSTER_CANT_CREATE_DUP_CLUSTER_NAME means the requested cluster name is already in use. The name can conflict with DNS, Active Directory computer objects, or an existing cluster name.
What to check
- Check DNS for existing A/AAAA records and verify whether they belong to an active service.
- Check Active Directory for an enabled computer object with the same name.
- Choose a unique cluster name or resolve stale identity objects through the approved directory-management process.
Microsoft: Failover Clustering overview
Microsoft: Validate hardware for a failover cluster
Microsoft: Troubleshoot Cluster service startup
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