Is this for SAML?
When setting up the SAML Authentication on the Server Configuration screen, you'll need to change the 'Tableau Server return URL' to the new URL that end users will be accessing. This will tell Tableau Server where to route the SSO information.
Here is a link going into a little more detail: Quick Start: Single Sign-On with SAML
Hope this helps!
This is not for SAML, We don't have SAML enabled.We have configured SSL