What does Windows error code 5075 (ERROR_CLUSTER_INCOMPATIBLE_VERSIONS) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The joining node has an operating system version incompatible with the existing cluster.

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ERROR_CLUSTER_JOIN_ABORTED	ERROR_CLUSTER_MAXNUM_OF_RESOURCES_EXCEEDED

ERROR_CLUSTER_INCOMPATIBLE_VERSIONS

The node cannot join because the Windows versions or cluster feature levels are not supported together. This is not fixed by retrying the join; the node and cluster must meet the documented upgrade and compatibility requirements.

What to check

Compare Windows Server versions, servicing levels, and installed clustering components on every node.
Run validation before attempting the join again.
Use a supported upgrade sequence when moving a cluster to a newer server version.

Test-Cluster

Microsoft: Test-Cluster

Microsoft: Create and manage a failover cluster

Microsoft: Failover Clustering overview

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