Resolved Struggle with Setting parent to an object Netcode using NetworkObject.TrySetParent

I'm trying to SetParent of all vehicles in the scene to an gameobject. all the objects have NetworkObject
I'm spawning the Vehicles from the server first a CarContainer and then a vehicle. after that in update loot I'm checking if object are spawned then I am trying to vehicles.TrySetParent(carContainer) but it's not working now here is my code.

Code (CSharp):

1. public void SpawnObjectOnServerStart()
2.         {
3.             carContainer = Instantiate(carContainer);
4.             carContainer.Spawn(true);
5.            
6.             // trafficSystem.LoadCars(false, 0);
7.             var fgWayPoint = FindObjectsOfType<FCGWaypointsContainer>();
8.             Debug.Log(fgWayPoint.Length+" FG WayPoint");
9.             for (var i = 0; i < MaxNpcVehicles; i++)
10.             {
11.                 var veh = Instantiate(npcVehiclePrefab[Random.Range(0, npcVehiclePrefab.Length)], fgWayPoint[i].AvanceNode(0, 0, 6),
12.                     fgWayPoint[i].NodeRotation(0, 0));
13.                 veh.GetComponent<TrafficCar>().sideAtual = 0;
14.                 veh.GetComponent<TrafficCar>().atualWay = fgWayPoint[i].transform;
15.                 veh.GetComponent<TrafficCar>().atualWayScript = fgWayPoint[i];
16.                 var nObject = veh.GetComponent<NetworkObject>();
17.                 nObject.Spawn(true);
18.                 _parentVehicles.Add(nObject);
19.                 // var isParented = nObject.TrySetParent(carContainer.GetComponent<NetworkObject>());
20.                 // Debug.Log("Vehicle has parent: "+isParented);
21.             }

Code (CSharp):

1. private void Update()
2.         {
3.             if (!IsServer) return;
4.             if (carContainer.IsSpawned)
5.             {
6.                 if (_parentVehicles.Count < 1) return;
7.                 for (var i = 0; i < _parentVehicles.Count; i++)
8.                 {
9.                     if (!_parentVehicles[i].IsSpawned) continue;
10.                     if (_parentVehicles[i].transform.parent != null)
11.                     {
12.                         _parentVehicles.Remove(_parentVehicles[i]);
13.                         i--;
14.                         continue;
15.                     }
16.  
17.                     // _parentVehicles[i].transform.SetParent(carContainer.transform);
18.                     Debug.Log(_parentVehicles[i].TrySetParent(carContainer) +
19.                               $" {_parentVehicles[i].name} trying to parent");
20.  
21.                 }
22.             }
23.         }

Please Guide me on what I'm missing. as it's giving me false I suppose it's reverting the network object to its original state. but what I'm missing I've followed the documentations and trying to solve this from a week by myself.

 

Fixed I disabled the networktransform before parenting and spawning. after object is spawned it is successfully parented