Solved
Hi socaltester,
Do you have a sample of the successful request which you need to send to your service?
Here: https://techdocs.broadcom.com/content/broadcom/techdocs/us/en/ca-enterprise-software/layer7-api-management/api-gateway/9-0/policy-assertions/assertion-palette/xml-security-assertions/create-saml-token-assertion.html I found an example of a SAML assertion.