identify gameobjects on the scene

How to identify two differente gameobjects on the scenne? for example if i have a prefab "Player" and more than 1 instance of this prefab on the scene, I have enemies that chase these instances of players but so far, i can't distinguish each player, for example the enemy always chase the owner in each client, doesn't matter which player has entered on ontriggerenter of the enemy collider.

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