Any pointers regarding this?
There used to be a separate KB article but now it's been incorporated into OnlineHelp for the link you mention in your first posting. The second paragraph of that article:
You can change from local authentication to Active Directory or you can change from Active Directory to local authentication. In either case, to change the authentication type, you complete these steps:
There really is no way to simply *toggle* from one authentication method to another. It does require a complete uninstall/reinstall of the software to switch from one authentication method to the other.
In order to switch from Active Directory to Local Authentication you need to do a complete uninstall and reinstallation of Tableau Server. This would also include (after doing a complete backup) removing the "C:\ProgramData\Tableau\Tableau Server" Folder as well as "C:\Program Files\Tableau\Tableau Server.
When reinstalling Tableau Server, Choose "Use Local Authentication" and hit OK. When you get the startup page to enter the new admin account, make sure to CLOSE the page (you are going to restore the backup before creating the admin account). After you run the restore command with the --no-config (prevents inheritance of the previous configuration). *Note: You will get a notice that the backup file uses a different authentication method so you will also need to run the tabadmin reset after the configuration completes.
Once this occurs you when then create the admin account by typing in the http://localhost (or if using port 443) https://localhost in your browser. This will let you create the Admin account with a manually typed password for the local authentication.
This is the very closest answer. Since my server is located in DMZ and also I installed Tableau in D drive, I followed little extra steps.
Thank you for the input. Yes, I need to follow the entire KB article. So, it worked out.