用ExecuteQuery()访问sharepoint link时，提示Identity Client Runtime Library (IDCRL) could not look up the realm information for a federated sign-in.

我使用C#编写了一段访问sharepoint的代码：

访问sharepoint时，指定Office365账号和密码

这个问题比较着急，希望能2025/9/18回复。谢谢。

具体如下：

using Microsoft.SharePoint.Client;

using System;

using (ClientContext context = new ClientContext(Site)

            {

                try

                {

                    // 初始化保存账号密码的变量并保存密码

                    var securePassword = new System.Security.SecureString();

                    foreach (char c in password)

                    {

                        securePassword.AppendChar(c);

                    }

                    // 通过API生成访问sharepoint的凭据

                    context.Credentials = new SharePointOnlineCredentials(userName, securePassword);

                    Web web = context.Web;

                    context.Load(web);

                    context.ExecuteQuery();  -》这里执行时报错。参考程序执行时的错误内容

                }

                catch (Exception ex)

                {

                    CommonUtils.Log(clazzName + ": checkStandardFileLinkAccessToVisit():Error :" + ex.Message);

                    Console.WriteLine(ex.Message);

                    return false;

                }

            }

程序执行时的错误内容：

Identity Client Runtime Library (IDCRL) could not look up the realm information for a federated sign-in.

希望回复的内容：

1. 以上代码执行时出错的原因是什么？
2. 如何解决？使代码可以成功访问sharepoint link？