Re: ESXi 6.5 - Used cli to add a port group fine, however the web ui or vcenter web ui doesn't show port group

That "Correct Answer" is for VMWare 5, which makes it NOT the correct answer.

I found the solution for out vCenter 6 environment was to put the affected ESX host into maintenance mode and reboot it. That caused the GUI (and fat client) to see the newly added VLANs and port groups.