IDP Config - X509 SubjectName

I am trying to setup Idp InitiatedSSO. I was trying to debug SAML response sent to Service Provider.
I found that Saml response missing . How can i get these in Saml response

We include the X509Certificate rather than the X509SubjectName. The X509Certificate is much more useful for problem determination etc. Most SAML offerings include the X509Certificate and not the X509SubjectName.

Does the SP require the X509SubjectName to be present? That would be unusual and not something we’ve seen.