In your vSphere do you happen to have Windows 7 or 10 streamed VM that got in a reported as in an Unknown Power State ? if yes please follow my tip.
From that screen you remove that VM from your DDC inventory.
On the vSphere you remove it too from the inventory, don’t delete from disk
You click to browse your datastore
On your VM .vmx you right click to
You follow that wizard
Now you return in the DDC, you need to re-add that machine
In your desktop group your re-add it too;
Now both system will be syncro !