I was recently built up a new Cluster of 3 host with a Distributed Switch. I had created my Management and vMotion groups with no issues, but when I created the server port group it did not show up under hosts. The VM’s were already built and working on the network, and I only noticed this issue when I tried to vMotion one of the VM’s to another host.
To fix the issue I had to create a new port group for that vlan and migrate the VM’s over to it. I then deleted the old port group, and renamed the new one to the old ones name. I have no idea why this happened my only guess is that I hit some really weird bug.