MS Entra Proxy + IdP V5.1.4 - RelayState missing error?

[Lazar, Michael E]

Hi gang,

I'm working on the MS Entra Proxy config and I believe I have all the parts in-place, but when I run through the test, I'm seeing the following error in my process log, pasted below.

I must be missing something, because it's supposed to work, and last time I did this I was able to get past this error somehow, just have no idea how. Anyone with some tips on how to troubleshoot this?
Thanks,
-Michael.

2025-05-15 21:38:50,261 - 130.166.10.158 - DEBUG [org.springframework.web.servlet.DispatcherServlet:120] - POST "/idp/profile/Authn/SAML2/POST/SSO", parameters={masked}
2025-05-15 21:38:50,276 - 130.166.10.158 - DEBUG [org.springframework.webflow.mvc.servlet.FlowHandlerMapping:114] - No flow mapping found for request with URI '/idp/profile/Authn/SAML2/POST/SSO'
2025-05-15 21:38:50,286 - 130.166.10.158 - DEBUG [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping:531] - Mapped to net.shibboleth.idp.saml.saml2.profile.impl.SAMLAuthnController#finishSAML(HttpServletRequest, HttpServletResponse, String)
2025-05-15 21:38:50,339 - 130.166.10.158 - ERROR [net.shibboleth.idp.authn.ExternalAuthenticationException:144] -
net.shibboleth.idp.authn.ExternalAuthenticationException: No RelayState parameter, unable to resume flow execution
               at net.shibboleth.idp.saml.saml2.profile.impl.SAMLAuthnController.finishSAML(SAMLAuthnController.java:259)
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://shibboleth.net/pipermail/users/attachments/20250516/d96c3fbb/attachment.htm>