We are integrating Keycloak with a SAML identity provider (dutch government). We seem to receive a valid response from the other party but Keycloak does seam to be able to parse the SAML response. The error we get is: 09:08:41,029 ERROR [io.undertow.request] (default task-14) UT005023: Exception handling request to /realms/datahub/login-actions/first-broker-login: org.jboss.resteasy.spi.UnhandledException: java.lang.RuntimeEx ception: java.lang.RuntimeException: com.ctc.wstx.exc.WstxParsingException: Undeclared namespace prefix "ds" When we run the received XML through a validation tool (https://www.samltool.com/validate_xml.php) it indicates that it is valid. Can I somehow attach the XML here? Erwin​ ​ ----------------------------- Rovecom Erwin Steffens | Rovecom softwareontwikkelaar Elbe 2, 7908 HB Hoogeveen Postbus 2126, 7900 BC Hoogeveen 0528 22 35 35 Voortdurend bezig met innoveren om beweging te stimuleren en groei te realiseren. Wij zijn Rovecom. Disclaimer: http://www.rovecom.nl/maildisclaimer. Wanneer de link niet werkt, plak de link dan in uw internet browser. -----------------------------