Problem with changing the threshold of bloom via script when button is pressed

Unity Engine
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1

changing the threshold of bloom via script not working
here is my script:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Rendering.Universal;
using UnityEngine.Rendering;

public class SlowMotion1 : MonoBehaviour
{
[SerializeField] private Volume volume;
public float slowMotionTimescale;

private float startTimescale;
private float startFixedDeltaTime;

void Start()
{
    startTimescale = Time.timeScale;
    startFixedDeltaTime = Time.fixedDeltaTime;
}

void Update()
{
    if (Input.GetKeyDown(KeyCode.E))
    {
        StartSlowMotion();

        if (volume.profile.TryGet(out Bloom bloom))
        {
            bloom.intensity.value = 0.2f;
            bloom.threshold.value = 10f;
        }

    }

    if (Input.GetKeyUp(KeyCode.E))
    {
        StopSlowMotion();
        if (volume.profile.TryGet(out Bloom bloom))
        {
            bloom.intensity.value = 1f;
            bloom.threshold.value = 0.72f;
        }
    }
}

private void StartSlowMotion()
{
    Time.timeScale = slowMotionTimescale;
    Time.fixedDeltaTime = startFixedDeltaTime * slowMotionTimescale;
}

private void StopSlowMotion()
{
    Time.timeScale = startTimescale;
    Time.fixedDeltaTime = startFixedDeltaTime;
}

}