After spending a day on this issue, I have a working solution (I’ll post a tutorial or whatever someday).
explained in this AnswerHub question that Simple Move to Location was not meant to be used in multiplayer.
posted an answer in the same AnswerHub question, which works. It uses a server-side AI Pawn, which does the movement. Your player-controlled pawn replicates the AI Pawn’s movement in it’s Event Tick.
In answer he uses a lerp of the server-pawn’s transform and the client-proxy. If you experience any stuttering effect on the client, that’s why. just use the server-pawn’s transform.
And don’t forget to destroy the AI-Pawn when you destroy your player’s pawn (and vice-versa).