Unfortunately, Air does not support "IdP-initiated authentication" at this time, so users cannot login directly from their Identity Provider's home page or application directory.
Once your workspace has SAML SSO enabled, and has verified your domain you can sign in from https://app.air.inc/saml-sso-login or the workspace-specific URL https://api.air.inc/integrations/saml/login/{ORGANIZATION-WORKSPACE-ID} . The workspace URL automatically redirects you to your identity provider and does not prompt for your email again.