Currently IDP initiated SSO workflow to Adobe is not supported in creative cloud or any adobe products. Having one place to access all your apps under your IDP makes accessing applications easier for end users. Currently Adobe only supports SP initiated SSO, so you have to go to the site in order to then sign in and access your needed resources. Whats strange, is we actually have to pay extra for SSO functionality, but, this doesnt encompass full functionality cause it can't be accessed fromour IDP. I would like to put in a feature request for IDP initiated SSO workflow for creative cloud and adobe SaaS products.