Unable to Join Computer to a Cluster in Failover Cluster Manager

Error:

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.

Fix:

Open up PowerShell (as administrator) on that computer and type the following…

import-module failoverclusters

clear-clusternode

Example:

 Windows PowerShell
 Copyright (C) 2016 Microsoft Corporation. All rights reserved.
 PS C:\Windows\system32> import-module failoverclusters
 PS C:\Windows\system32> clear-clusternode
 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
 PS C:\Windows\system32>

Sources

Cannot create Cluster – the computer X is joined to a cluster