Are you using tableau server.
when we integrate tableau in our webpage then we can use sso. Once webpage login then no need to login tableau again.
Please use the sso.Refer
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Are you embedding the tableau pages in a website?
You have to allow the guest access in tableau server.
Once the trusted authentication is setup from tableau server and the website server,you have to follow the below step.
1.Allow third party cookies as the embedding tableau uses client side rendering.
What type of authentication are you using on Tableau Server?
If you are using Active Directory authentication, you need to check on Enable automatic logon on the configuration page.
Once you complete that you need to make sure the site is a trusted site or it should be in intranet zone.