Currently, SSO is unavailable for Tableau Online. If you want to integrate dashboards via Online, I would suggest using iframes and using the Salesforce Web tab to embed your dashboards. Use the url that is referenced when you click on the share icon for the dashboard. I would discourage embedding dashboards within a Salesforce object(ie Account, Opportunity) since the login issue makes it awkward for use.
Hope this helps.
Is it possible to implement some sort of SSO solution with Tableau Online? Is SAML a possibility? Has anyone implemented some way of getting around the login screen? I'm curious if when you say "SSO is unavailable for Tableau Online" if you are referring strictly to Trusted Auth or is there no way to implement a SSO with Tableau Online?
I'm not the best person to answer SSO capability with Tableau Online. To my knowledge, it's not available currently.