I've created a custom OrderStatus in the uCommerce_OrderStatus table, and added a new Pipeline 'ToOrderRequiresReview' to it. In the Custom.config I've then added a reference to this Pipeline and also a custom task that would simply send an email to an administrator like this:

<!-- Pipeline Instance that is called when an order is set to needing a review-->
<component id="ToOrderRequiresReview"
               service="UCommerce.Pipelines.IPipeline`1[[UCommerce.EntitiesV2.PurchaseOrder, UCommerce]], UCommerce"
               type="UCommerce.Pipelines.OrderProcessing.OrderProcessingPipeline, UCommerce.Pipelines">
  <parameters>
    <tasks>
      <array>

        <!--Send email to the admin-->
        <value>${ToOrderRequiresReview.OrderRequiresReview}</value>

      </array>
    </tasks>
  </parameters>
</component>


<component
 id="ToOrderRequiresReview.OrderRequiresReview"
 service="UCommerce.Pipelines.IPipelineTask`1[[UCommerce.EntitiesV2.PurchaseOrder, UCommerce]], UCommerce"
 type="Custom.Services.PipelineTasks.OrderRequiresReviewTask, Custom.Services" />

Using the uCommerce interface when changing the order status this is triggering the Pipeline correctly, however I also want to trigger this Pipeline from my code. I've tried the below code where I'm setting the order status and saving the basket but my pipeline task never executes:

var basket = TransactionLibrary.GetBasket();
            basket.PurchaseOrder.OrderStatus =
                OrderStatus.FirstOrDefault(
                    x => x.OrderStatusId == 1000003);

basket.Save();

 //I've tried with and without this line of code
 TransactionLibrary.ExecuteBasketPipeline();

Is there something I'm missing here to force this pipeline to trigger?