Currently single sign-on is not supported when accessing ArcGIS Sites directly as the app relies on authentication being parsed through from prior in the session, i.e. when you hit the portal home page. Because of this, users are prompted to sign in when hitting an ArcGIS Site directly via a URL or embedded page.
Could Sites, and apps across the board, please be configured to support SSO out of the box? The current discrepancies between apps provides an inconsistent user experience for SSO and "seamless" navigation.
