Invalid Configuration
Ensure that the XML document in your Source is a valid XML document, and matches the SAML specification.
Unsigned Authentication Requests
Ensure that your provided configuration includes WantAuthnRequestsSigned="true" as a property on the <SPSSODescriptor> if you want us to sign authentication requests. We default to false if the property is not specified.
For further assistance with OAuth2 troubleshooting, contact Edlink support or your Customer Success Manager.