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

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C#

Unity3D

changing the threshold 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;
    }
}

What I have tried:

i tried to change it via bloom.threshold.value