Anyone can help me on this issue, i cant find any similar issue online, I setup the SMTP config in AppSetting.Json, when the form submitted, the user cant receive any email and these error was thrown. I also test the SMTP config input, it can be connect using other smtp connection tester eg: "GMass"

Umbraco Version 9.4.3 Umbraco Forms package 9.3.0

Appsetting.Json

"Umbraco": {
        "CMS": {
            "Global": {
                "Smtp": {
                    "From": "email taken out",
                    "Host": "smtp.office365.com",
                    "Port": "587",
                    "Username": "user name taken out",
                    "Password": "password taken out",
                    "SecureSocketOptions": "Auto"
                }
            }
        }
    }

Error In Backend Log

System.Threading.Tasks.TaskCanceledException: A task was canceled.
   at MailKit.Net.NetworkStream.ReadAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
   at MailKit.Net.Smtp.SmtpStream.ReadAheadAsync(Boolean doAsync, CancellationToken cancellationToken)
   at MailKit.Net.Smtp.SmtpStream.ReadResponseAsync(Boolean doAsync, CancellationToken cancellationToken)
   at MailKit.Net.Smtp.SmtpClient.ConnectAsync(String host, Int32 port, SecureSocketOptions options, Boolean doAsync, CancellationToken cancellationToken)
   at Umbraco.Cms.Infrastructure.Mail.EmailSender.SendAsyncInternal(EmailMessage message, String emailType, Boolean enableNotification)
   at Umbraco.Cms.Infrastructure.Mail.EmailSender.SendAsync(EmailMessage message, String emailType)
   at Umbraco.Forms.Core.Services.WorkflowEmailService.SendEmailAsync(SendEmailArgs args)
   at Umbraco.Forms.Core.Providers.WorkflowTypes.SendRazorEmail.Execute(WorkflowExecutionContext context)