Send email using office 365 SMTP C#

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C#

I am trying to send email using office 365 smtp connection and i am having problem to configure it and sen email. hear is my coding in my .net core application.
I am not getting any error meassages but email is not sending

What I have tried:

public static int SendMail(string subject,string message,string toAddress, string CcAddress, string BCC)
		{
			int res = 0;
			try
			{
				string fromAddress = "support@domain.com";
				var credentials = new ClientSecretCredential(
									"<client ID>", "<tenent ID>", "<client secret>",
								new TokenCredentialOptions { AuthorityHost = AzureAuthorityHosts.AzurePublicCloud });
				GraphServiceClient graphServiceClient = new GraphServiceClient(credentials);


				string[] toMail = toAddress.Split(',');
				//-----
				Logger.Log(toAddress + "|| toaddress sendemail");
				//-----
				List<Recipient> toRecipients = new List<Recipient>();
				int i = 0;
				for (i = 0; i < toMail.Count(); i++)
				{
					Recipient toRecipient = new Recipient();
					EmailAddress toEmailAddress = new EmailAddress();

					toEmailAddress.Address = toMail[i];
					toRecipient.EmailAddress = toEmailAddress;
					toRecipients.Add(toRecipient);
				}

				List<Recipient> ccRecipients = new List<Recipient>();
				if (!string.IsNullOrEmpty(CcAddress))
				{
					string[] ccMail = CcAddress.Split(',');
					int j = 0;
					for (j = 0; j < ccMail.Count(); j++)
					{
						Recipient ccRecipient = new Recipient();
						EmailAddress ccEmailAddress = new EmailAddress();

						ccEmailAddress.Address = ccMail[j];
						ccRecipient.EmailAddress = ccEmailAddress;
						ccRecipients.Add(ccRecipient);
					}
				}
				var mailMessage = new Message
				{
					Subject = subject,
					
					Body = new ItemBody
					{
						ContentType = BodyType.Html,
						Content = message
					},
					ToRecipients = toRecipients,
					CcRecipients = ccRecipients

				};

				Microsoft.Graph.Users.Item.SendMail.SendMailPostRequestBody body = new Microsoft.Graph.Users.Item.SendMail.SendMailPostRequestBody()
				{
					Message = mailMessage,
					SaveToSentItems = false  // or true, as you want
				};

				// Send mail as the given user. 
				graphServiceClient
				   .Users[fromAddress]
					.SendMail
					.PostAsync(body);

				Logger.Log("Email Send Sucessful || SendEmail");
				res = 1;

			}
			catch (Exception ex)
			{
				Logger.Log(ex.Message + "|| Send Email Method");
				res = 0;
			}
			return res;
		}