检查您导入到 Ping Identity 的 Spring SAML 元数据.它似乎包含与 Spring SAML 在其 SAML 身份验证请求中发送的不同的 AssertionConsumerURL:

Check the Spring SAML metadata you import to Ping Identity. It seems to contain a different AssertionConsumerURL than what Spring SAML sends in its SAML Authentication Request:

https://xxxwm07.integration.company.at:9031/sp/ACS.saml2