我已经从C#生成日历邀请（.ics文件）。我也验证了使用icalendar验证器。
但是，当我发送该文件从outlook到另一个outlook邮件它不显示为邀请。也与gmail到outlook和outlook到gmail工作正常
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/ Create a calendar invitation
            string icsContent =
                "BEGIN:VCALENDAR\r\n" +
                "PRODID:-//Microsoft Corporation//Outlook 16.0 MIMEDIR//EN\r\n" +
                "VERSION:2.0\r\n" +
                "METHOD:REQUEST\r\n" +
                "BEGIN:VEVENT\r\n" +
                "DTSTART:20230302T160000Z\r\n" +
                "DTEND:20230302T170000Z\r\n" +
                "LOCATION:Conference Room\r\n" +
                "UID:" + Guid.NewGuid().ToString() + "\r\n" +
                "DESCRIPTION:Please join us for a meeting.\r\n" +
                "SUMMARY:Meeting Invitation\r\n" +
                "ORGANIZER;CN=Sender Name:MAILTO:sender@example.com\r\n" +
                "ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=Recipient Name:MAILTO:recipient@example.com\r\n" +
                "END:VEVENT\r\n" +
                "END:VCALENDAR\r\n";

            // Add the calendar invitation as an attachment
            Attachment icsAttachment = new Attachment(new System.IO.MemoryStream(System.Text.Encoding.UTF8.GetBytes(icsContent)), "invitation.ics", "text/calendar");
            message.Attachments.Add(icsAttachment);

但是，当我发送该文件从outlook到另一个outlook邮件它不显示为邀请。也与gmail到outlook和outlook到gmail工作正常