Hi, if the actor you want to destroy replicates, then if I remember correctly you only need to destroy it on the server and it will be automatically destroyed on the client as well. And if it does not replicate, then you can’t send a reference to it from the server to the client (the reference will/should be nullptr on the client).
One solution would be to make the actor replicate and then only spawn and destroy it on the server. If the actor already does replicate, then make sure you only spawn it on the server and not on the client as well, cause otherwise you will have two actors on the client side.