Outlook升级OAuth2.0认证方式,SMTP发送总是显示535 5.7.3 Authentication unsuccessful

成功获取了token,里面的权限也包含了Mail.Send

await client.ConnectAsync("smtp.office365.com", 587, SecureSocketOptions.StartTls);

var oauth2 = new SaslMechanismOAuth2("******@outlook.com", accessToken); //这个邮箱与申请token的是同一个

await client.AuthenticateAsync(oauth2);

string str = await client.SendAsync(email);

await client.DisconnectAsync(true);

一直提示以下错误：MailKit.Security.AuthenticationException: 535: 5.7.3 Authentication unsuccessful [TYAPR01CA0105.jpnprd01.prod.outlook.com 2025-02-23T08:50:14.475Z 08DD5385FDB4F996]