SP-Initiated call not working, throwing 500 error

Document ID : KB000073132
Last Modified Date : 13/03/2018
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SP-Initiated call is not working, Throwing 500 error, where the IDP-initiated is working as expected . SAML request sending as signed, we have imported signing certificate yet still it is throwing 500 error
Verification certificate provided by SP does not match the Subject of the certificate the SP is using to sign the authnrequest. SP needs to sign with, or provide to IDP the correct certificate.