RPC caller reference

The following RPC is working, but “OnSetTeam” never gets fired. Any idea why?

	UPROPERTY(BlueprintReadOnly, VisibleAnywhere, Replicated, ReplicatedUsing=OnSetTeam, Transient)
	UTeam* Team;

	UFUNCTION(BlueprintCallable, Server, Reliable, WithValidation, Category = "Empires|GameState")
	void TryChooseTeam(AEmpiresPlayerState* Player, ETeamName TeamName);

void AEmpiresPlayerState::TryChooseTeam_Implementation(AEmpiresPlayerState* Player, ETeamName TeamName)
{
	UTeam* Team = nullptr;
	switch (TeamName)
	{
	case ETeamName::TN_BrenodiEmpire:
		Team = UEmpiresFunctionLibrary::GetGameMode(this)->BrenodiEmpire;
		break;
	case ETeamName::TN_NorthernFaction:
		Team = UEmpiresFunctionLibrary::GetGameMode(this)->NorthernFaction;
		break;
	case ETeamName::TN_None:
		break;
	default:
		break;
	}

	Player->Team = Team;
}