You cannot embed HTTPS content in a webpage which you're accessing via HTTP.
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There are two problems embedding this page inside Tableau Server/Public:
* your Tableau server doesn't seem to have the right certficates for https (hence the red line through 'https' in the url), and https pages can only be embedded in 'correct' https pages
* more importantly in this situation: the Tableau website doesn't allow itself to be embedded inside an iframe (which is what an URL container in a dashboard is)
So: the Tableau homepage (and probably any other www.tableau.com webpage) can't be embedded inside a Tableau dashboard...
Hope this helps.
Johan de Groot