此错误通常发生在使用SAML响应进行身份验证时，可能存在SAML响应的签名验证失败。如果ADFS检测到签名验证失败，则会返回错误消息"Error with signature verification"。解决此问题的一种方法是检查SAML响应的签名配置是否正确，并确保签名证书已正确安装。以下是一个示例代码，通过此示例，您可以测试您的SAML响应是否能够通过签名验证。

using System;
using System.Security.Cryptography.X509Certificates;
using System.Xml;
using System.Xml.Serialization;
using Microsoft.IdentityModel.Protocols.Saml2;
using Microsoft.IdentityModel.Tokens;

namespace SamlValidator
{
    class Program
    {
        static void Main(string[] args)
        {
            //SAML Response string
            string xmlString = "...";

            //Extract SAML Response XML
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.LoadXml(xmlString);

            //Load Signing Certificate
            X509Certificate2 certificate = new X509Certificate2(@"C:\Certificates\Signing.pfx", "password");

            //Read and deserialize SAML Response
            Saml2SecurityTokenHandler handler = new Saml2SecurityTokenHandler();
            XmlReader reader = new XmlNodeReader(xmlDoc);
            Saml2SecurityToken token = (Saml2SecurityToken)handler.ReadToken(reader);

            //Validate SAML Response Signature
            SecurityToken validatedToken;
            TokenValidationParameters validationParameters = new TokenValidationParameters
            {
                ValidIssuer = "ADFS Issuer URI",
                IssuerSigningKey = new X509SecurityKey(certificate.PublicKey),
                ValidateAudience = false,
                ValidateIssuerSigningKey = true,
                ValidateLifetime = true
            };
            handler.ValidateToken(token, validationParameters, out validatedToken);

            Console.WriteLine("SAML Response Signature Validation: PASSED");
        }
    }
}