https://community.appian.com/discussions/f/administration/40264/saml-retain-casingHi, in our environment the IdP changed some usernames from lowercase to uppercase. Appian configured for SAML authentication with &quot;Retain Casing&quot; option, returns error code 401. Do you have any experience that the configuration option at docs.appianen-USTelligent Community 12https://community.appian.com/thread/153910?ContentTypeID=1Tue, 10 Mar 2026 10:21:44 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:06841614-a9df-4f0c-a0ed-ded49294c9d9Shubham Aware<p>Use Lowercase instead of Retain Casing for SAML username attribute. It matches both casings.<br />Changes apply hot - no restarts needed.<br /><a href="/support/w/kb/753/kb-1450-how-to-troubleshoot-saml-login-issues-impacting-only-some-users">https://community.appian.com/support/w/kb/753/kb-1450-how-to-troubleshoot-saml-login-issues-impacting-only-some-users</a></p><div style="clear:both;"></div>