My OnTriggerEnter2D(Collider2D other) not working

Hi there, I have a script which I attached it to my obstacles, and when the player collides with the obstacles, a debug log should print out a message "Player Respawn". However, my OnTriggerEnter2D in the script is not working and I dont know why. Can someone help me please?

 public class KillPlayer : MonoBehaviour {
  
      public LevelManger levelManager;
  
      // Use this for initialization
      void Start ()
      {
          levelManager = FindObjectOfType<LevelManger>();
      }
      
      // Update is called once per frame
      void Update () {
      
      }
  
      void OnTriggerEnter2D(Collider2D other)
      {
          if (other.tag == "Player")
          {
              levelManager.RespawnPlayer();
          }
      }
  }

And below is the script for LevelManger:

  public class LevelManger : MonoBehaviour {
  
      // Use this for initialization
      void Start () {
      
      }
      
      // Update is called once per frame
      void Update () {
      
      }
  
      public void RespawnPlayer()
      {
          Debug.Log("Player Respawn");
      }
  }

And this is my Player:

And this is my obstacle which I attached KillPlayer script to: