Check if the PNID is IP or FQDN
/usr/lib/vmware-vmafd/bin/vmafd-cli get-pnid --server-name localhost
If the PNID is IP, you should be able to access the vCenter via IP
If the PNID is FQDN, the after the login page, it would redirect to FQDN. In that case, you should have the PTR Record.