So, the "Create item in another site" action works GREAT for me when I have a static, explicit URL. I can create items all day long with no issue.
BUT, I need to create items where I don't know the site until run time. The action allows a reference to be used for the Site URL. So I pull in the URL from a Workflow Variable. When I click Refresh, it pops up a dialog box saying: "The Site URL contains reference tags. Please manually replace any remaining tags."
Ok, I say to myself, that makes sense, it needs a real site to look at so it can populate the List dropdown. No worries, since any site I'm going to give it will have the same lists/libraries. I give it an explicit site URL, click ok, and the List dropdown refreshes. I pick the Shared Documents library, pick the Content Type, set the Name field, and save. Publish the workflow.
When I run it I get the dreaded "Object reference not set to an instance of an object." error.
What am I missing here? (See below for a screenshot of the action's configuration.)