using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        bool retry = false; /* This should be declared outside of the do loop, otherwise it gives build error*/

        do

        {

            TimeSpan? delay; /* This should be declared outside of the do loop, otherwise it gives build error*/

        try

        {

            result = await publicClientApplication.AcquireTokenForClient(scopes, account).ExecuteAsync();

        }

        catch (MsalServiceException serviceException)

        {

            if (ex.ErrorCode == "temporarily_unavailable") /* The exception variable needs to be changed to serviceException */

            {

                RetryConditionHeaderValue retryAfter = serviceException.Headers.RetryAfter;

                if (retryAfter.Delta.HasValue)

                {

                    delay = retryAfter.Delta;

                }

                else if (retryAfter.Date.HasValue)

                {

                    delay = retryAfter.Date.Value.Offset;

                }

            }

        }

    …

    if (delay.HasValue)

    {

        Thread.Sleep((int)delay.Value.TotalMilliseconds); // sleep or other

        retry = true;

    }

} while (retry);

​

    }

}