The strings are returning true, but it is not changing the Game Mode HUD class as I want
Is it a bug?
I don’t believe simply changing the hud string mid-game will actually update the hud. The hud class is sent to the client when they connect, not after.
Try calling this method on the player controller:
UFUNCTION(BlueprintCallable, Category="HUD", Reliable, Client)
void ClientSetHUD(TSubclassOf<class AHUD> NewHUDClass);