CreateAssetSimple.cs

private void Start()
  {
    CreateAndWaitUntilCompleted("prefab");
  }

  private async Task CreateAndWaitUntilCompleted(string label)
  {
    var locations = await Addressables.LoadResourceLocationsAsync(label).Task;
    await Addressables.InstantiateAsync(locations[0]).Task;
  }

CreateAssetsSimple.cs

private void Start()
  {
    CreateAndWaitUntilCompleted("prefab");
  }

  private async Task CreateAndWaitUntilCompleted(string label)
  {
    var locations = await Addressables.LoadResourceLocationsAsync(label).Task;

    foreach (var VARIABLE in locations)
      await Addressables.InstantiateAsync(locations).Task;
  }