title: Link to SSO App from external site when user is signed into multiple Google Identities
body: <p>Trying to link to GSuite SAML Apps from an external site (intranet).</p>
  <p>If the user is not logged in to any Google Identities, or only logged in to the GSuite Organization's Identity, everything works.</p>
  <p>If they are logged into some other Google Identity (their personal Gmail), there is a 404 error. The resolution is to ask the user to sign out of their personal account in order for the SAML App link to work, which is undesirable.</p>
  <p>Link I'm using is:</p>
  <pre><code>https://www.google.com/a/my-gsuiteorg.com/ServiceLogin?service=mail&amp;passive=true&amp;rm=false&amp;continue=https%3A%2F%2Fapis.google.com%2Fadditnow%2Fl%3Fapplicationid%3D000000000000%26__ls%3Dogb%26__lu%3Dhttps%253A%252F%252Fapp.thirdpartyapp.com%252Flogin%253Fpartner_uid%253Dgoogle%0000cid%253Dpar_google_gam_launch_co-
  </code></pre>