The IP Address xx.xx.xx.xx is already in use. To continue, specify a different IP address.
We may encounter the above error message while performing SQL Server Cluster Installation.
1. You may need to remove ARP address and then restart the cluster installation.
2. If deleting ARP doesn't fix the issue, then you may continue with the DHCP and complete the installation, later you can add static DNS entries by getting the DHCP IP address to the SQL Server network name from failover cluster manager.