mailKit Failed to receive mail from outlook mailbox using c# during login step

Question

    imapClient.Connect(account.Server, account.Port, SecureSocketOptions.SslOnConnect, tokenSource.Token);
                //imapClient.Authenticate(account.Account, account.Password, tokenSource.Token);
                imapClient.AuthenticationMechanisms.Add("XOAUTH2");
                imapClient.Authenticate(System.Text.Encoding.UTF8,account.Account, account.Password, tokenSource.Token)

c# code so login prompt login failure
How do I log in successfully