Spawn a power up after asteroid death

So I am making an asteroids clone to get used to Unity. I have the Asteroids spawning and such and destroying via my bullets from the ship and a GUI that updates the score/lives as well as a shield power up(that has 2 uses per pickup).

I made a PowerUpSpawner to hold the shield and any future powerups I make.

 public class PowerUpManagerBehaviour : MonoBehaviour 
 {
     
     public List<GameObject> PowerUps = new List<GameObject>();
       
     public void SpawnPowerUp(Vector3 position)

{ var powerUp = Random.Range(0,PowerUps.Count); var randomAngle = Random.Range(0,360); PU = PowerUps[powerUp]; Instantiate(PU,position, Quaternion.AngleAxis(randomAngle,Vector3.up)); } }

Now what I want to do is call the SpawnPowerUp and get a GameObject back in my AsteroidsBehaviour like this.

         void OnTriggerEnter(Collider colliderObject)
         {
             if(colliderObject.transform.tag.Equals("Bullet"))
             {
                 Destroy(gameObject);
                 Instantiate(AsteroidExplosion,transform.position,transform.rotation);
                 
                 //Access powerupspawner and spawn a power up.
                 var PUMB = GameObject.Find("PowerUpSpawner");
 PUMB.GetComponent().SpawnPowerUp(transform.position);
 
             }
         }
     }

Now even though it seems like it should spawn the powerUp (a random one via the Spawnpowerup) when the asteroid dies, it doesn't do anything. I have my shield two times in my PowerUpSpawner GameObject in the scene so I'm not sure why it's not spawning at all...

Any help would be really appreciated.

EDIT: Cleaned up the code for the non important and empty methods etc.