Simpler example on how to use a cancellation token to stop an async function on a Unity MonoBehaviour

UniTaskDemo_CancellationTokenSimple.cs

using Cysharp.Threading.Tasks;
using System;
using System.Threading;
using UnityEngine;

public class UniTaskDemo_CancellationToken : MonoBehaviour
{
    void Start()
    {
        //Start our example!
        AnimateExample().Forget();
    }

    /// <summary>
    /// Animate to a destination position
    /// </summary>
    public async UniTask Animate(Vector3 destination, float duration)
    {
        //Get unity provided token for this component
        var token = destroyCancellationToken;

        float lerp = 0f;
        Vector3 startPos = transform.position;
        while(lerp < 1f && !token.IsCancellationRequested)
        {
            lerp += Time.deltaTime / duration;
            transform.position = Vector3.Lerp(startPos, destination, lerp);
            
            //await next frame (note the token argument for this to be cancelled early!)
            await UniTask.Yield(token).SuppressCancellationThrow();
        }

        if(!token.IsCancellationRequested)
        {
            transform.position = destination;
            Debug.Log($"Successfully animated to '{destination}'", this);
        }
    }
}