>5.  Computer name and FQDN names are the same.  Server name is VC651, FQDN name is VC651.domain.com.  The FQDN resolves over DNS forward lookup

Can you confirm the reverse lookup works for IP to FQDN ?

please make sure the reverse lookup returns the IP

Documentation: DNS Requirements for vCenter Server and Platform Services Controller on Windows

Windows requirements: vCenter Server for Windows Requirements