only had a quick look but my guess is this, you can only call RPC with ownership, if BP_Board is added to the level its owned by the server so clients cant call RPCs.
this fix is to call the RPC from the pawn and/or controller which you do own
only had a quick look but my guess is this, you can only call RPC with ownership, if BP_Board is added to the level its owned by the server so clients cant call RPCs.
this fix is to call the RPC from the pawn and/or controller which you do own