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ERROR_CLUSTER_NODE_EXISTS
This usually occurs while adding a node that is already a member or when a previous add operation left a membership record. Treat it as a configuration-state problem, not as a reason to immediately evict or delete the node.
What to check
- Check whether the node already appears in the cluster and whether its state is Up, Down, Paused, or Joining.
- Review the earlier add-node attempt in the cluster log before attempting another join.
- If the node was intentionally removed, verify that the removal completed cleanly before reusing the same identity.
Get-ClusterNodeMicrosoft: Create and manage a failover cluster
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