I think you’re just not allowed to use this node.
Also, the node is under FORTNITE NPC module (which means Non Player Character) so it might make sense to not have access to this. Many things in UEFN are not allowed.
If you want a particle system to perfectly follow your player, the only way at the moment is to use the VFX Creator Stick to Body Part method. But you won’t be able to use a vortex this way. All the other methods are either glitchy, or laggy…