I am looking to set up IdP Initiated SSO from a custom application acting as the IdP to Qualtrics. I have not been able to find anything helpful so far. I keep getting a “MALFORMED_RESPONSE” Error when sending the SAML Response to Qualtrics. I have validated that the SAML response is valid. Any thoughts or suggestions on how to successfully log into Qualtrics with an IdP initiated SAML response to Qualtrics would be appreciated. 

I am using the .Net 4.7 Framework from and MVC application to try and login.