Do NOT spam RPC calls on tick! You will totally destroy the games bandwidth in half a second, and the more players you have in a game the worse it will get. The server already has a replicated variable of the players pitch… Its in the player controller, just get that and update a replicated variable that other players then can retrieve to update animation states etc, with zero RPCs used.
On server in pawn bp: Get Control Rotation > Set “RotationVariable” (replicated)
and there you go!