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Is setting up Single Sign On an option? Are the customers already authenticated when they come to the site/page in which these are embedded?
Basically you are being asked to authenticate for each embedded viz.. If this is a web page/app just create a landing page that asks for a login and authenticate there once for the session.
Or, if it's internal and you are using AD, use that for the single sign on.
If Single Sign On in Tableau is a new concept, start here: Authentication
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Tableau Online Deployment Advisor