Microsoft Graph Api Integration issue

[abdullahakm]

We want to use Microsoft Graph Api (Outlook.Calendar this Api endpoint : https://graph.microsoft.com/v1.0/me/events?$select=subject,body,bodyPreview,organizer,attendees,start,end,location) with all the required configuration related to azure.
The below is our console app code, in future we move our console app to Background Service
try
{
var credential = new ClientSecretCredential(TenantId, ClientId, ClientSecret);

    var authProvider = new AzureIdentityAuthenticationProvider(
        credential,
        scopes: ["https://graph.microsoft.com/.default"],
        isCaeEnabled: false 
    );

    var graphClient = new GraphServiceClient(authProvider);

    string userIdentifier = "our user identity";

    var events = await graphClient.Users[userIdentifier].Events
        .GetAsync(requestConfig =>
        {
            requestConfig.QueryParameters.Select = new[] {
                "subject", "bodyPreview", "organizer", "start", "end", "location"
            };
            requestConfig.QueryParameters.Top = 10;
        });

    Console.WriteLine($"Success! Found {events?.Value?.Count ?? 0} events.");
}
catch (Exception ex)
{
    Console.WriteLine($"Error: {ex.Message}");
    Console.WriteLine($"Details: {ex.InnerException?.Message}");
    Console.WriteLine("TIP: Check permissions, user ID format, and try disabling CAE");
}

}

This error is occurred : Microsoft.Kiota.Abstractions.ApiException: 'The server returned an unexpected status code and the error registered for this code failed to deserialize: 401'.

Can anyone have idea of this issue?