MailKit: Get this error when I append the message to the sent folder using imap client

Hi, I get the below error when I append the message to the sent folder. the same code has worked before. But for some reason, it stopped working. Error is below: The IMAP server replied to the ‘APPEND’ command with a ‘BAD’ response: Additional arguments found after last expected argument

My code is below:

using (var imapClient = new ImapClient(new NullProtocolLogger()))
{
    var imapSecurity = emailConfiguration.IMAPSecurityConfiguration;
    var imapSecurityEnum = imapSecurity.Trim().ToLower().Contains("ssl")
        ? SecureSocketOptions.SslOnConnect
        : SecureSocketOptions.StartTls;

    imapClient.Connect(emailConfiguration.IMAPServer, emailConfiguration.IMAPPort,
        imapSecurityEnum);
    imapClient.AuthenticationMechanisms.Remove("XOAUTH2");
    imapClient.Authenticate(emailConfiguration.UserName,
        emailConfiguration.Password);

    var personalFolders = imapClient.GetFolders(imapClient.PersonalNamespaces[0]);

    var sentFolder = personalFolders.FirstOrDefault(r => r.Name.ToLower().Contains("sent"));
    if (sentFolder != null)
    {
        sentFolder.Open(FolderAccess.ReadWrite);
        sentFolder.Append(message);
        sentFolder.Close();
    }
}