how save data between maps in multiplayer ?

hey devs , where i can save my data between maps ? So i got GM where players earns points , and after game ends it should send all players to the Main Menu where thay can see all earned points , where i can save it ?and what class or data i can use to identify user ? tried with GameInstance but didn;t worked

The server can save the points in the Game Instance, then you can populate the UI for the other players when they finally then join the new lobby, or session.