Deployment failures can be caused by configuration issues, especially problems with the networking setup.
You start a vCenter HA cluster configuration, and it fails with an error. The error might show the cause of the problem, for example, you might see an SSH Connection Failed message.
If deployment fails, take steps to resolve the network issues.
Verify that the Passive and Witness nodes can be reached from the Active node.
Verify that routing between the nodes is set up correctly.
Check network latency.