AADSTS7500525: There was an XML error in the SAML message. Verify that the XML content of the SAML messages conforms to the SAML protocol specifications.

SAML for ASP.NET Core
1

Hi Team ,

Suddenly, I started facing the below issue. and not getting root cause of it.
using ComponentSpace.Saml2.Licensed 4.8.0, for SP initiated flow.

Using below method -
await _samlServiceProvider.InitiateSsoAsync(partnerName, relayState, ssoOptions);

Error Message -

AADSTS7500525: There was an XML error in the SAML message at line 1, position 540. Verify that the XML content of the SAML messages conforms to the SAML protocol specifications.
When I did research on the error - I learned that required field in SAML Request is missing .
When investigate the SAML Request I found the Issuer is missing in SAML Request.
Attaching the Logs for your reference. Please guide on this issue.



2

The issuer field comes from the LocalServiceProviderConfiguration.Name.

Your custom configuration resolver is returning null for this value.