Did someone know how to get the controller who actually clicked on an actor - without casting the controller?
Did the onClicked node give any informations about who raised the event? Maybe somewhere hidden?
My solution so far - you need to cast the controller. The event will not give you any more information.
So, to identify the client who clicked (and if he actually “owns” the actor) I had to set a variable “Player Number” on the PlayerController, the PlayerPawn, an all the actors that should belong to him for every client.
After that it was quiet easy…
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Was interested in hearing about this as well, I guess your attachment might shed some more light on it but it seems to not work. 
Hope it will work now.