Help with GameObject.FindGameObjectsWithTag

So I am trying to find all the enemies in the game when the missile is shot. The problem I'm having is that GameObject.FindGameObjectsWithTag is returning an array of length zero instead of giving me an array of all the enemies. I've checked to make sure that I do in fact have enemies in the game with the "Enemy" tag on them. Heres my code for it. Im hoping it just something small or I forgot to click something but any help would be greatly appreciated!

 public float bulletSpeed;
 public float rotSpeed;
 public GameObject[] potentialTargets;
 public float maxRange;
 public float maxAngle;
 GameObject lockedTarget;

 void Start(){

     if (potentialTargets == null) {
         potentialTargets = GameObject.FindGameObjectsWithTag("Enemy");
     }
     Debug.Log(potentialTargets);
     if(potentialTargets.Length == 0) {
         Debug.Log("Length is zero");
     }
     foreach (GameObject target in potentialTargets) {

         float dist = Vector2.Distance(transform.position, target.transform.position);
         float angle = Vector2.Angle(transform.position, target.transform.position);
         Debug.Log(dist);
         Debug.Log(angle);
         if(dist < maxRange && angle < maxAngle) {

             lockedTarget = target;
         }
     }
 }`