After reviewing how you have replied, its clear you need to go back to the drawing board and take several steps back. Here is how I advise you to proceed.
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Start with a new third person BP template project, and change the number of player settings and set to play as listen server.
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Get character movement to replicate properly. (Just ensure actors and movement comp are replicated.)
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Then get the AI to follow the player, but have it work across the client and server. Once you understand how to get an AI to do something have it work for the client and server, you should be able to generalize that framework.