The code in the scheduled task is very straightforward. All of this code works as expected:
// productImport contains values to set on document
TreeNode newNode = TreeNode.New(classname);
newNode.SetValue("value1", productImport.Value1);
newNode.SetValue("value2", productImport.Value2);
// etc
newNode.DocumentCulture = CultureHelper.DefaultCulture.Name;
DocumentHelper.InsertDocument(newNode, parentNodeID, new TreeProvider());

All of that works, and my new node is created with the correct values. Then:

bool? success = document.CreateDefaultSKU();

This always returns false, and in the Event Log I get the following:

Event code: CREATEDEFAULTSKU
Description: Message: User is not authorized for creating products.
Stack Trace:


I get the same error if I configure the document type to always create an e-commerce Product when a new document is created.

As Administrator, I can go through CMSDesk and create a new document, and it will correctly create the related Product. Also, for the nodes created by the scheduled task, as Administrator I can edit them and create Products.

It is only when using the API through a scheduled task that the creation of the Product fails.