Send emails using the oracle cloud infrastructure email in C#

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C#

MVC5

I am sending Email from My C# code to Oracle Cloud Infrastructure Email But it's giving me Following Error

Error: "The server response was: Authentication required|Inner Exception"

Following is my Code

try
{
    // Retrieve SMTP configuration from web.config
    string smtpHost = ConfigurationManager.AppSettings["SMTPHost"];
    int smtpPort = int.Parse(ConfigurationManager.AppSettings["SMTPPort"]);
    string senderEmail = ConfigurationManager.AppSettings["SenderEmail"];
    string senderID = ConfigurationManager.AppSettings["SenderUser"];
    string senderPassword = ConfigurationManager.AppSettings["SenderPwd"];

    // Define the recipient, subject, and body of the email
    string recipientEmail = "akki@gmail.com";
    string subject = "Test Email From New Details";
    string body = "This is a test email sent from ASP.NET MVC.";

    // Create a new MailMessage object
    using (MailMessage mail = new MailMessage())
    {
        mail.From = new MailAddress(senderEmail);
        mail.To.Add(recipientEmail);
        mail.Subject = subject;
        mail.Body = body;
        mail.IsBodyHtml = true;

        // Create a new SmtpClient object
        using (SmtpClient smtpClient = new SmtpClient(smtpHost, smtpPort))
        {
            smtpClient.UseDefaultCredentials = false;
            //smtpClient.Credentials = new NetworkCredential(senderEmail, senderPassword);
            smtpClient.Credentials = new NetworkCredential(senderID, senderPassword);
            smtpClient.EnableSsl = true; // Ensure this matches the server's SSL requirements

            // Send the email
            smtpClient.Send(mail);
            //ViewBag.Message = "Email sent successfully!";
        }
    }
}
catch (SmtpException smtpEx)
{
    // Log SMTP specific errors
    //ViewBag.Message = $"SMTP Exception: {smtpEx.Message}";
    Console.WriteLine(smtpEx.Message);
}
catch (Exception ex)
{
    // Log general errors
    //ViewBag.Message = $"General Exception: {ex.Message}";
    Console.WriteLine(ex.Message);
}

Following is orcal cloud configuration

<pre><add key="SMTPHost" value="smtp.email.ap-mumbai-1.oci.oraclecloud.com" />

<add key="SMTPPort" value="587" />

What I have tried:

i have treid many thing didnt find code