根据官方文档，Auth0支持基于SOAP的绑定。在SAML配置中，需要添加"wstrust"选项来启用基于SOAP的绑定。以下是一个示例配置：

{
  "name": "My SAML integration",
  "description": "Integration with My Identity Provider using SAML",
  "enabled": true,
  "settings": {
    "acs": "https://myapp.auth0.com/login/callback",
    "audience": "urn:myapp:production",
    "mappings": {
      "email": "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress",
      "name": "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name"
    },
    "wstrust": {
      "certificate": "-----BEGIN CERTIFICATE-----\nMIIDBzCCAe+..."
    }
  }
}

在配置中，"wstrust"选项指定了用于基于SOAP的绑定的证书。注意，如果使用基于SOAP的绑定，则需要在Identity Provider端配置相应的服务来处理SOAP请求和响应。

参考链接：https://auth0.com/docs/protocols/saml/saml-configuration-options#soap-binding-with-wstrust