In the meantime, would you like to embed the username and password directly in your viz? So no one has to login.
This might help you for the moment: http://mkt.tableausoftware.com/downloads/embedding_views.pdf
Awaiting your answer.
Lénaïc RIÉDINGER, Global Community Engineer Tableau
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If you don't mind can you share your code. you should be able to send the req second time without the tickets.
I have Dashboard scenario where user access dashboard it will have some URL action,when the click on link based on job title 2 categories (Top,Senior) it will access data in external website.
Click Me on link goes to Gmail pages and some other user click on the same click it will also Gmail but both email inbox are their personal. How to achieve this using URL option