Hi,
You are trying to test SP Initiated federation journey.
Once you hit the SP initiated URL, It will redirect to IDP along with the SAML request.
--> /affwebservices/public/saml2sso?SAMLRequest=
IDP will decode the SAML request and fetch the required details for processing the request. Once it finds an authentication URL, it will send the request to authentication URL along with SAML request like below.
/affwebservices/redirectjsp/redirect.jsp?SAMLRequest=
Since authentication URL is protected, you will get login page to enter the credentials and once authentication/authorization is successfull, it will redirect the request to public/saml2sso along with SMSESSION and SAML request like below.
/affwebservices/public/saml2sso?SMASSERTIONREF=QUERY&SAMLRequest=f
Are you using custom login page? if so please make sure to redirect the request to public/saml2sso after the authentication.
Also please check the FWSTrace logs for the transaction ID and find out what is the error coming in the logs.
Also is it failing after entering the credentials or before entering the credentials?
Thanks,
Sharan