Client HUD doesn't update

Hi guys… i’m struggling with this problem…

So, both client or server when one of them pick up an ability from Level, this one destroyes and in HUD i want the icon for the firsti ability change color.

When i pick up the ability, this one know which player has taken itself. I debugged and this variable is known on the server.

So at this point, I execute a ServerOnlyEvent on the abilityBP which tells to the player to change the HUD.
It calls a ClientEvent.

It doesn’t work… how could i do?