Photon Network, synchronize a int over the network.

Hello im having problem with a scoreboard, when i try to synchronize an int which in this case is number of deaths, they dont really synchronize at all over the network. Here’s my scoreboard script. I’d love to know what the problem is!
Thanks

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class Scoreboard : MonoBehaviour
{
	public GameObject ScoreboardGO;

	//Team stuff
	public int Team1K;
	public int Team2K;

	//Text
	public Text Team1Text;
	public Text Team2Text;

	//synchronization part!!
	//HERE IS THE PROBLEM
	void OnPhotonSerializeView(PhotonStream stream, PhotonMessageInfo info)
	{
		if (stream.isWriting)
		{
			stream.SendNext(Team1K);
		}
		else
		{
			Team1K = (int)stream.ReceiveNext();
		}
	}
	
	void  Update()
	{
		//THIS IS JUST FOR DEBUGGING
		if(Input.GetKeyDown(KeyCode.C))
		{
			Team1K += 1;
		}

		//Setting scoreboard and toggeling
		if(Input.GetKey(KeyCode.Tab))
		{
			ScoreboardGO.SetActive(true);
		}
		else
		{
			ScoreboardGO.SetActive(false);
		}

		//Set int to text
		Team1Text.text = Team1K.ToString("F0");
		Team2Text.text = Team2K.ToString("F0");
	}
}

Thanks @ChristianSimon

 if (PhotonNetwork.inRoom)
 {
     ExitGames.Client.Photon.Hashtable ht = new ExitGames.Client.Photon.Hashtable() { { "Team1K", Team1K + 1 } };
 
     PhotonNetwork.room.SetCustomProperties(ht);
 }

 void OnPhotonCustomRoomPropertiesChanged(Hashtable propertiesThatChanged)
 {
     Team1K = (int) propertiesThatChanged["Team1K"];
 }