AI follow player in a multiplayer game

Hi guys,

I’m currently working on a VR multiplayer game.
For the context : The player is a pawn, the body an AI.(character + behaviour tree)
What i want, is to store in the blackboard the target player the AI should follow, each player will have his own AI assigned.

I’m pretty new to UE and followed a tutorial where the AI is using “Multisphere trace for object” in order to find a player to follow, i would like to modify it so the AI follow a specific player.
(i thought to identify this player by tag or by custom collisions, but not sure this is the right way to do it)

Sorry for my bad english,
Any help will be welcome!