Object not spawned on future clients

Hi. I have a script, that spawns an object from the Start method, which is run when the player joins the server. The problem I have, is that when player 2 joins, the object that player 1 spawned, doesnt get spawned for player 2. This is my code:

     void Start()
     {
         if (isLocalPlayer)
         {
             CmdSpawn();
         }
     }

     [Command]
     public void CmdSpawn()
     {
         GameObject go = (GameObject)Instantiate(hookPrefab, transform.position, transform.rotation);
         NetworkServer.SpawnWithClientAuthority(go, gameObject);
         RpcSetHook(go);
     }
     
     [ClientRpc]
     void RpcSetHook(GameObject go)
     {
         hook = go;
     }