C# Office 365 Exchange EWS:“；访问被拒绝。请检查凭据，然后重试。进程无法获取正确的属性；

尝试使用以下代码在共享邮箱中创建约会：

ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010);
service.Credentials = new WebCredentials("user_id", "password");
service.AutodiscoverUrl(user_id, RedirectionUrlValidationCallback); //resolves to https://outlook.office365.com/EWS/Exchange.asmx

Appointment meeting1 = new Appointment(service);
            meeting1.Subject = "subject";
            meeting1.Body = "body";
            meeting1.Start = Convert.ToDateTime("some datetime");

            DateTime end = Convert.ToDateTime("some datetime");
            meeting1.End = end.AddMinutes(Convert.ToInt32("some number"));

ServicePointManager.ServerCertificateValidationCallback = (sender, certificate, chain, sslPolicyErrors) => true;

Mailbox test = new Mailbox("some email");
FolderId folderid = new FolderId(WellKnownFolderName.Calendar, test);
meeting1.Save(folderid,SendInvitationsMode.SendToAllAndSaveCopy);

它返回的错误是：

    Access is denied. Check credentials and try again., The process failed to get the correct properties.

---

我知道凭据是正确的，因为对

AutodiscoverUrl

的调用返回了有效的URL。所以我不知道为什么它在再次调用

save（）

？

时会说“访问被拒绝”，回答我自己的问题

---

正在传递的特定用户需要被授予对相关邮箱文件夹的写入权限。

Exchange Online正在拒绝基本身份验证。我建议您升级到现代身份验证（基于OAuth 2.0）