Ping
SP-Initiated SSO
When configuring Shibboleth SP to use a PingFederate (PingIdentity) IdP, do not use the "/idp/startSSO.ping" endpoint as this is a proprietary Ping endpoint for IdP-Initiated SSO which is not for SAML 2 requests and will drop the RelayState parameter. Â Use the "/idp/SSO.saml2" endpoint for expected Shibboleth SP behavior.
PingFederate has non-standard metadata handling and usage and is unable to automatically consume multiple entity descriptions at once.