Issue
When you use the Tableau Prep command line interface to publish to a project not in the default site, the following error occurs, and the publication fails:
Unable to establish output connection
When you use the Tableau Prep command line interface to publish to a project not in the default site, the following error occurs, and the publication fails:
Earlier versions of Tableau Prep’s Command Line Interface (CLI) functionality (2018.2.2 and earlier) only had the ability to publish to the Default site with the "contentUrl":"" syntax”.
In order to publish to non-default sites, upgrade to 2018.2.3 or later to enjoy the full functionality of Tableau Prep’s CLI.