When user clicks Sing up you redirect the page to , please see the bottom left corner as I have hovered over the button.
Please update the redirection such that dataFastVisitorId and dataFastSessionId is sent in request query parameters. For example,
https://app.agencyhandy.com/sign-up?dataFastVisitorId=<VISITOR_ID>&dataFastSessionId=<SESSION_ID>&...
Note: “...” in the above example means anything else that you already send in the request parameters other than these two new items we are about to add.