How to Reference Player when Instantiating Prefab

You need to add a reference to the Player in a script of your freshly instantiated GameObject. You can do it from the instantiator script or from the instanciated one.

From the instatiator class

 using UnityEngine;

 class ClassWhichInstantiatePrefab : MonoBehaviour
 {
     public GameObject Prefab;
     private Player _player;
 
     private void Start()
     {
         // You may need a different logic here to retrieve
         // the Player, change it to fit your needs.
         _player = GetComponent<Player>();
     }
 
     public void MethodWhichInstantiatePrefab()
     {
         var go = Instantiate(Prefab);
         var component = go.GetComponent<YourComponent>();

         component.Player = _player;
     }
 }

From the instance class

 class MyClass
 {
     private Player _player;
 
     private void Start()
     {
         _player = FindObjectOfType<Player>();
     }
 }