Flex now supports Single Sign-On Identity Providers that disallow iframed logins

Flex now supports Single Sign-On Identity Providers that disallow iframed logins. For enhanced security, some services prevent accessing their login forms if they are loaded from within another webpage. If you embed Flex within another application, you can now safely launch your SSO login from a dedicated popup window and avoid iframe restrictions.

You can enable the 'Login Using Popup' feature and set your Single Sign-On configuration within the Twilio Console.