When trying to create a new cluster in Failover Cluster Manager, trying to add a new server gives the following error…
The computer "xxxxx" is joined to a cluster.
The computer is cloning from an existing computer that was part of a cluster.
Open up PowerShell (as administrator) on that computer and type the following…
import-module failoverclusters clear-clusternode
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PS C:\Windows\system32> import-module failoverclusters
PS C:\Windows\system32> clear-clusternode
Are you sure you want to forcefully clean up cluster node xxxxx?
[Y] Yes [N] No [S] Suspend [?] Help (default is "Y"): y