The reference you have provided is for Tableau Online. I am wondering if there is a guide around how to do this for an On-Prem implementation. Not sure what the Key is that should be used in the SAML dialog box of the Config TS.
Did you able to solve the SSO authentication using Okta. We are having the same issue. Would it be possible to share your knowledge.
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It is important to understand that SAML is an additional layer of authentication that overlays of the base Tableau Server authentication method. In this case, Active Directory (AD) authentication is the base authentication method and OKTA is the additional SAML authentication method. When using SAML only usernames are stored within Tableau Server. Those usernames are passed to the Identity Provider (IdP - in this case OKTA) for authentication. The IdP (OKTA) confirms that the username provided by Tableau Server is identical to the username stored in the IdP. If it is, a success response is sent to Tableau Server and displays the page according to the user's permissions within Tableau Server.
To begin, ensure that Tableau Server is authenticating as expected using AD authentication. If it is not, you will need to address these authentication issues before pursuing the additional OKTA authentication layer. If Tableau Server is authenticating as expected using AD authentication, you can begin adding OKTA SAML Authentication. The first step there is to ensure that OKTA is properly integrated with AD in order to ensure all usernames are stored in the OKTA. Next, you will need to export meta data files from OKTA and load them into Tableau Server.
Refer to your OKTA documentation for instructions on exporting the files. The following Tableau Server documentation on SAML should be used to review SAML & meta data file requirements, and contain instructions on how to upload files. Additional information on common SAML Troubleshooting is also available in the Tableau Server Administrator Guide.