Update Function not working within a script inside an instantiated prefab!

Hi!

[Context]:

I'm trying to create an item pick up system for my game where when the player enters a certain OverlapRadius, a previously disabled "UI" game object parented to the dropped item prefab is enabled (and conversly disabled when the player exits the overlap radius). Now the "UI" game object contains a script that tries to do two things:

1. Modify the transform.rotation of the "UI" game object every frame (so that it stays upright no matter the orientation of the item prefab).
   

2. Makes a referenced, child "canvas gameObject" transform.lookAt the main camera every frame(So that the item pick up letter indicator 'E' is always oriented to the game screen-indicating to the player, there's an item that could be picked up)

[Problem]:

The Update function simply doesn't get called inside the instantiated prefabs! The Canvas is enabled correctly but the lookAt() doesn't work. Tried using a bunch of Debug.Log()s all over the script and came to understand that the update function just doesn't get called. But this problem, for some reason, only occurs when I try to use the enable() method I wrote inside my ItemObject script (That sits on the dropped item prefab) that's responsible for enabling/disabling and only enabling/disabling the childed "UI" gameObject. When I just drag in the prefab from my asset menu directly into the scene, and set it's setActive() state to true, the LookAt() and everything work just fine! [Code]:

public class ItemPickUpUiBehavior : MonoBehaviour { ///Works public Canvas uiCanvas; public bool UiEnabled = true; private Transform cameraTransform;

 ///Works
 private void Awake()
 {
     cameraTransform = FindObjectOfType<Camera>().transform;
 }

 /// DOESn't WORK
 void Update()
 {
     if (UiEnabled)
     {
         transform.rotation = Quaternion.Euler(-transform.parent.rotation.eulerAngles);
         uiCanvas.transform.LookAt(cameraTransform);
     }
 }

 ///Works
 private void OnEnable()
 {
     UiEnabled = true;
 }
 ///Works
 private void OnDisable()
 {
     UiEnabled = false;
 }

}

I've been staring at this situation for over an hour and couldn't figure out what the problem is.
I tried looking through unity answers for similar situations but couldn't find anything helpful. Help would be much appreciated!!