Unity Networking enemy spawning is not working - unity3d

Question

I am making a multiplayer MMO with unity and I am stuck on syncing up enemy spawning between clients. Basically the enemies spawn as intended, but only on the user that spawned them. Here is my code (Sorry it is a bit long, just wanted to include any information that could be relevant, as the is my first time with networking):
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Networking;
[System.Serializable]
public class EnemySpawn {
public GameObject prefab;
public int difficulty;
public int rarity;
[HideInInspector()]
public GameObject instance;
}
public class EnemySpawner : NetworkBehaviour {
public EnemySpawn[] enemys;
public int maxDiff = 8;
public int spawnDistMin = 15;
public int spawnDistMax = 35;
public int spawnLvlDist = 30;
private int diffOnScreen;
private EnemySpawn enemyToSpawn;
public List<EnemySpawn> enemysOnScreen = new List<EnemySpawn>();
void Start() {
StartCoroutine (Spawn());
}
void Update() {
List<EnemySpawn> newEnemysOnScreen = new List<EnemySpawn>();
foreach(EnemySpawn c in enemysOnScreen) {
if (c.instance == null) {
diffOnScreen -= c.difficulty;
} else {
newEnemysOnScreen.Add (c);
}
}
enemysOnScreen = newEnemysOnScreen;
}
//IMPORTANT PART!!! \/\/\/
[Command]
void CmdSpawn(Vector3 pos) {
GameObject spawning = Instantiate (enemyToSpawn.prefab, pos, Quaternion.identity);
NetworkServer.Spawn (spawning);
diffOnScreen += enemyToSpawn.difficulty;
enemysOnScreen.Insert (0,enemyToSpawn);
enemysOnScreen [0].instance = spawning;
spawning.GetComponent<MonsterMain>().lvl = Mathf.RoundToInt(spawning.transform.position.magnitude / spawnLvlDist);
}
IEnumerator Spawn() {
while (true) {
int n = 0;
while (n != 1) {
enemyToSpawn = enemys [Random.Range (0, enemys.Length)];
n = Random.Range (1, enemyToSpawn.rarity);
}
while (maxDiff - diffOnScreen <= enemyToSpawn.difficulty) {
yield return null;
}
yield return null;
Transform player = Player.localPlayer.transform;
Vector2 randomOffset = Random.insideUnitCircle.normalized * Random.Range (spawnDistMin, spawnDistMax);
CmdSpawn(player.position + new Vector3(randomOffset.x,randomOffset.y,0));
}
}
}
I am using Unity 2017.1.3.3p3, and I am building this to IOS. It is a 2d game and I am using unity's build in networking system. Again everything works except that the enemies only spawn on one screen. I am connecting one phone to the editor. Any help is appreciated. thank you!