Click Start > Windows Administrative tools > Failover Cluster Manager to launch the Failover Cluster Manager.
Click Create Cluster.
Click Next.
Enter the server names that you want to add to the cluster.
Click Add.
Click Next.
Select Yes to allow verification of the cluster services.
For detailed steps, you can check the link https://learn.microsoft.com/en-US/troubleshoot/iis/configure-w3svc-wsfc
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