I was facing the same problem. The VMware Openstack VIO (VIO-Appliance-7.2.1.0-20003386_OVF10) was deployed successfully but upon trying to deploy it onto my vCenter, I would get the same error as you're getting.
So I tried to deploy older version of the VIO stack (VIO-Appliance-6.0.0.1-15475612_OVF10) and this worked. However, I made the following changes to the setting when deploying the OVF, specifically in the Kubernetes section.
Service Network CIDR (i entered 150.0.0.0/24)
POD Network CIDR (i entered 160.0.0.0/24)
Service network's Domain Name Suffix (i entered cluster.int)
I noticed these configurations in this video (https://www.youtube.com/watch?v=6YODgi0UsgU)
I then used the above 3 options when I deployed the VIO Appliance 7.2.1 version and this time when I connect to the vCenter the window progresses and bring up the deployment setup.
Let me us if the above fix works.