Player w/ Rigidbody and Collider is going through objects with Collider and Trigger

Unity Engine
1

I keep having issues with using the Colliders to kill or reset the scene. I have looked up a tin of posts and everyone keeps saying to make sure the player has a Rigidbody. It does. And both player and object have colliders. They do. But every time I enable “Is Trigger” on an object, my player goes right through it. If I turn off the Trigger, the player collides with the object but nothing happens. This has happened on 3 different games I have been trying to build, with and without tutorials. Everything else is working fine and I am getting no errors from Unity. Thanks for any help you can give.

Here the code Im using for an endless runner:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

Player Movement:

public class Obstacle : MonoBehaviour
{
    PlayerMovement playerMovement;

    // Start is called before the first frame update
    void Start()
    {
        playerMovement =GameObject.FindObjectOfType<PlayerMovement>();
    }

    private void OnCollisionEnter (Collision collision)
    {
        {
        if (collision.gameObject.name == "player")
         //Kill the Player
        playerMovement.Die();
        }
    }

}

public class PlayerMovement : MonoBehaviour
{
    bool alive = true;

   public float speed = 5;
   public Rigidbody rb;

   float horizontalInput;
   public float horizontalMultiplier = 2;


   private void FixedUpdate ()
   {
       if (!alive) return;
      
       Vector3 forwardMove = transform.forward * speed * Time.fixedDeltaTime;
       Vector3 horizontalMove = transform.right * horizontalInput * speed * Time.fixedDeltaTime * horizontalMultiplier;
       rb.MovePosition(rb.position + forwardMove + horizontalMove);
   }

   private void Update()
   {
       horizontalInput = Input.GetAxis("Horizontal");

       if (transform.position.y< -5)
       {
       Die();
       }
   }

    public void Die ()
    {
        alive = false;
        //Restart the game
        SceneManager.LoadScene(SceneManager.GetActiveScene().name);
    }
}

Obstacles:

public class Obstacle : MonoBehaviour
{
    PlayerMovement playerMovement;

        void Start()
    {
        playerMovement =GameObject.FindObjectOfType<PlayerMovement>();
    }

    private void OnCollisionEnter (Collision collision)
    {
        {
        if (collision.gameObject.name == "player")
         //Kill the Player
        playerMovement.Die();
        }
    }

}
2

After playing around with everything, I got it to work. I turned off “Is Trigger” from the obstacles and added the “Player” tag to my Player. I knew it would be something so simple that I was over looking haha