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"Unknown Failure" is a generic description of a failure that could represent any number of issues. If you are the Tableau Server administrator, you can look up the reason in the "Background Tasks for Extracts" admin view under the Status page of Tableau Server. If you are not the administrator, ask them to look into it for you. And upvote this Idea added by Kai Connell!
If your Admin is the ambitious type, have them consider opening up access to the Tableau Server repository and building a custom admin view off of these data sources, and letting their users self-serve with this information.
Thanks Matt! This was very helpful. I'm the sole Tableau resource at our company so I'm the Server Admin as well. I had not come across the 'Background Tasks for Extracts' view yet.
My issue was permissions in SQL itself. The SQL view I was referencing called in Functions that Tableau did not have permissions too. I would have been on the hunt forever if it wasn't for the detailed error in the Background Tasks dashboard.
I voted up the idea above and will read your other link now. I've been interested in how to connect to the Tableau Server postgreSQL repository database. I will review your article and post any questions I might have there.