在calendarView上使用nextLink的Microsoft Graph API在ErrorAccessDenied中的结果

using Microsoft.Graph;
using Microsoft.Identity.Client;

public class CalendarService
{
    private static async Task<string> GetAccessTokenAsync()
    {
        IConfidentialClientApplication app = ConfidentialClientApplicationBuilder.Create("client-id")
            .WithClientSecret("client-secret")
            .WithAuthority(new Uri("https://login.microsoftonline.com/tenant-id"))
            .Build();

        string[] scopes = new string[] { "https://graph.microsoft.com/.default" };
        var result = await app.AcquireTokenForClient(scopes).ExecuteAsync();
        return result.AccessToken;
    }

    public static async Task<List<Event>> GetCalendarEventsAsync(DateTime startDateTime, DateTime endDateTime)
    {
        try
        {
            var accessToken = await GetAccessTokenAsync();
            var graphClient = new GraphServiceClient(new DelegateAuthenticationProvider((requestMessage) =>
            {
                requestMessage.Headers.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
                return Task.CompletedTask;
            }));

            var events = new List<Event>();
            var pageIterator = graphClient.Me.CalendarView.Request()
                .Filter($"start/dateTime ge '{startDateTime:o}' and end/dateTime le '{endDateTime:o}'")
                .GetAsync();

            while (pageIterator != null)
            {
                var currentPage = await pageIterator.CurrentPage;
                events.AddRange(currentPage);
                if (pageIterator.NextLink != null)
                {
                    pageIterator = graphClient.Me.CalendarView.Request(pageIterator.NextLink).GetAsync();
                }
                else
                {
                    pageIterator = null;
                }
            }

            return events;
        }
        catch (ServiceException ex) when (ex.Error.Code == "ErrorAccessDenied")
        {
            // Handle the access denied error
            Console.WriteLine("Access denied: " + ex.Message);
            throw;
        }
    }
}