I have a tableau server 8.1 in trial mode.
I'm adding Tableau integration in a web application. I use trusted authentication method. But it sometimes works, sometimes doesn't. Most of times it just generates one of these two errors (randomly):
But some times it works and shows the view.
Currently I'm not storing ticket in session or other place. Just to first make sure authentication works then keep it in session.
You might try this article as a first step:
Error "Could not locate unexpired trusted ticket" | Tableau Software
Hope it helps!
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