I am very new to Workflow, I started using it on Monday. I have created a simple form that asks a user for some information in regards to a trouble ticket in Workflow 7(basically a front end for HelpDesk). At first I built out the workflow where the user had to type in their email address, now I would like to move to getting their AD user details and autofilling their email into the field.

My currently workflow looks like this:

Webform Project:

Start
Get Current User (HttpContext) outputs 'CurrentUser'
Split Text into Collection splits 'CurrentUser' into domain and username using \ delimiter, outputs 'UserCollection'
Get Users with Details picks from user container and finds the [UserCollection].last (logon name) in the pre-windows 2000 username field. Outputs to 'FoundUser'
    On Success -> Copy Data Element to New Location takes [FoundUser].last (should always be fetching a single user anyway) to output 'CurrentADUser'
    On Null -> Goto Duplicate form where they can manually add their email address.
    On Error -> Goto End

After a successful find of the user they should be presented with a form where they fill out the title, comment, severity, and priority of the ticket. The issue I am experiencing is that Email Address: isn't being populated. The form contains [CurrentADUser].EmailAddress put into the top of the form as a field builder. When I sign into my laptop as myself and go to the page after a quick load 'Email Address:' is empty. 

Once the user submits the ticket they are directed to a page that displays a success message that auto closes in 5 seconds and the helpdesk is notified of the ticket and the end user receives a confirmation email.
tl;dr -> How do i determine a current AD users email address and auto populate it into a field so they don't have to type.
Edit: Forgot to add, I have input the details of the DC to use and changed web.config to 'Windows' authentication.