Is this server-wide SAML or site-specific SAML? What version of Tableau Server?
We are currently struggling to set up site-specific SAML, Tableau Server 10.3.3, with SiteMinder CA. Very similar experience - followed documentation, got nowhere. We have been working now with Tableau support. They have been engaged, helpful, and sometimes also baffled.
Its server-wide saml...we are using 9.3