My SyncVar resets each time a client joins.

I wish to increase the counter of my client joining. The extract of the playermanager (Player prefab) is as under:

public override void OnStartClient()

 {
     Debug.Log(netId);
     CmdAddPlayer();
     Debug.Log(ClientPlayers+":)");
     Debug.Log(Players + ":/");
 }

  [SyncVar(hook = nameof(SyncPlayers))]
 public int Players;

 [ClientCallback]
 public void SyncPlayers(int olddata, int newdata)
 {
     this.Players=newdata;
     ClientPlayers = newdata;
 }

 [Command]
 void CmdAddPlayer()
 {
     Players++;
 }

I need to increase the variable "Player" whenever a client joins and this should be synced with the new client.

When I run this on server acting as host and client, the player variable changes to 1. But, if a client joins and I debug the client, it shows 0. If I debug the server, it shows 1.

I get this Warning as well: Trying to send command for object without authority. PlayerManager.CmdAddPlayer UnityEngine.Debug:LogWarning(Object)

Please help.