Hi,
May I know which SOAP web service method you are using? If this is a UserProfileService such as GetUserProfileByName, would it be possible for you to drag the data fields onto your canvas, preview your form, and check if fields such as PreferredName is populated? If it's populated, then you would need to set the value of the Employee field to the desired node, if not, then the problem isn't the approach you are using but the data on your server is missing or not complete. Please let me know if this helps.