Events don't trigger with AR camera

Hello.

I am trying to get my AR camera to trigger an event to change the Post Processing behavior attached to it. I followed this tutorial "Unity Tutorial - How to Create Underwater FX". In it the person uses a normal camera and i assumed treating my AR one as he does his camera would work. It didn't.

I have attached a colider to both my camera and my object which is a box of water and would like the screen to change using PostProcessing Stack from the asset store. The code in the video is as such:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.PostProcessing;
5. public class ChangePostProcess : MonoBehaviour
6. {
7.    
8.     public PostProcessingProfile normal, fx;
9.     private PostProcessingBehaviour camImageFx;
10.    
11.     void Start()
12.     {
13.         camImageFx = FindObjectOfType<PostProcessingBehaviour>();
14.     }
15.  
16.     void OnTriggerEnter(Collider col)
17.     {
18.         if (col.CompareTag("Player"))
19.         {
20.             camImageFx.profile = fx;
21.         }
22.     }
23.  
24.     void OnTriggerExit(Collider col)
25.     {
26.         if (col.CompareTag("Player"))
27.         {
28.             camImageFx.profile = normal;
29.         }
30.     }
31. }

And yet the event doesn't seem to trigger.