User ID does not passover from Service Portal external login screen to SSO Login page. Issue <!-- div.margin{ padding: 10px 40px 40px 30px; } table.tocTable{ border: 1px solid; border-color:#E0E0E0; background-color: rgb(245, 245, 245); padding-top: .6em; padding-bottom: .6em; padding-left: .9em; padding-right: .6em; } table.noteTable{ border:1px solid; border-color:#E0E0E0; background-color: rgb(245, 245, 245); width: 100%; border-spacing:2; } table.internaltable { white-space:nowrap; text-align:left; border-width: 1px; border-collapse: collapse; font-size:14px; width: 85%; } table.internaltable th { border-width: 1px; padding: 5px; border-style: solid; border-color: rgb(245, 245, 245); background-color: rgb(245, 245, 245); } table.internaltable td { border-width: 1px; padding: 5px; border-style: solid; border-color: #E0E0E0; color: #000000; } .title { color: #D1232B; font-weight:normal; font-size:28px; } h1{ color: #D1232B; font-weight:normal; font-size:21px; margin-bottom:-5px } h2{ color: #646464; font-weight:bold; font-size:18px; } h3{ color: #000000; font-weight:BOLD; font-size:16px; text-decoration:underline; } h4{ color: #646464; font-weight:BOLD; font-size:15px; text-decoration:; } h5{ color: #000000; font-weight:BOLD; font-size:13px; text-decoration:; } h6{ color: #000000; font-weight:BOLD; font-size:14px; text-decoration:; } ul{ list-style: disc outside none; margin-left: 0; } li { padding-left: 1em; } --> Symptoms When you click "User External Login" on Service Portal Login page, there is a User ID field. When you enter your User ID in this field and click Login, you get redirected to external authentication page. On this page, the username field is blank, i.e. the User ID from previous screen did not pass over to this screen. Steps to reproduce: On an instance with SSO enabled, navigate to https://instancename.service-now.com/spBelow the Login button, click the "User external login" link.This will prompt you for only User ID.Enter the User ID and click submit.You will get redirected to SSO Login page. Expected behavior: Notice the Username field is empty. Actual behavior: The Username field should have populated with the User ID field from previous screen. Release All Releases Environment All Environments Cause This is expected behavior in the platform. The reason why the User ID does not pass over is because the Service Portal External Login and SSO Login page are two different products. As a result, integration between the two is not possible. Resolution If this functionality is extremely important to customer's business, connect with ServiceNow Professional Services team as this feature is not currently available out of the box and can only be implemented with customizations.