Getting the transform.Postion off a instantiated object

I am making a basic RTS game and i have an enemy in the world that must be able to detect the players units. The player units are instantiated objects that are in a List of gameobjects

 public List<GameObject> pooledObjects;
 
 pooledObjects = new List<GameObject>();
         GameObject tmp;
       
 
         for (int i = 0; i < amountToPool; i++)
         {
             if (pooledObjects.Count <= maxAllies)
             {
                 tmp = Instantiate(objectToPool);
                 tmp.SetActive(true);
                 pooledObjects.Add(tmp);
             }
         }

Currently how i am detecting the player is:

  void PlayerDetection()
     {
         if(Vector3.Distance(gameObject.transform.position, playerScript.agent.transform.position) < 13f)
         {
                 enemy.destination = GameObject.FindGameObjectWithTag("Player").transform.position;
 
         }
         else if (Vector3.Distance(gameObject.transform.position, playerScript.agent.transform.position) > 13f)
         {
             enemy.destination = gameObject.transform.position;
         }
     }

But doesnt work with the instatiated objects.

 void AllyDetection()
     {
         if(Vector3.Distance(gameObject.transform.position, ally.transform.position) < 13f)
         {
             enemy.destination = ally.transform.position;
         }
         else if (Vector3.Distance(gameObject.transform.position, ally.transform.position) > 13f)
         {
             enemy.destination = gameObject.transform.position;
         }
     }

Finding ally with:

 ally = GameObject.FindGameObjectWithTag("ally").GetComponent<GameObject>();