SurveyGizmo assigns each respondent a SessionID variable. How do I automatically have the SessionID variable passed when being redirected to another URL?
This should work:
When you’re testing, be sure to test using the Test or Share links; session IDs aren’t available in Preview or Style.
If that still doesn’t work, see if your survey is all contained on one page, or if it has multiple pages; this may not work if your survey is all on one page, but when I tested, it definitely works on a multi-page survey where the redirect is not on page 1.