DAP SAML SSO with VMware Workspace ONE IDP

For the SP initiated flow of SAML SSO, DPA is not redirecting to VMware Workspace ONE (WS1) IDP for authentication.

Anyone idea ? Below is the error we see in the log file

ERROR (2023-04-27T13:31:29,379-0800) [https-jsse-nio-8124-exec-4] CustomSaml2WebSsoAuthenticationRequestFilter:47 - Error occurred while generating AuthNRequest for SAML Authentication...
org.springframework.security.saml2.Saml2Exception: java.lang.IllegalArgumentException: Failed to resolve any signing credential


By the way, IDP initiated SAML SSO is working fine with WS1 without any issue.