问在C#应用程序中使用Azure REST API没有响应

EN

    public async Task<ResourceGroupModel> GetResourceGroupStatus()
    {
        ResourceGroupModel resourceGroupModel = null;
        try         
        { 
            string requestUrlString = iconfiguration.GetValue<string>("HealthSettings:AzureGetResourcesBySubscriptionURL");
            string azureSubscription = iconfiguration.GetValue<string>("HealthSettings:AzureSubscription");
            string clientId = iconfiguration.GetValue<string>("HealthSettings:ClientId");
            string tenantId = iconfiguration.GetValue<string>("HealthSettings:TenantId");
            string clientSecret = iconfiguration.GetValue<string>("HealthSettings:ClientSecret");
            Uri requestUrl = new Uri(requestUrlString.Replace("{subscriptionId}", azureSubscription));

            string token = await GetAccessToken(tenantId, clientId, clientSecret);

            _httpClient.DefaultRequestHeaders.Remove("Authorization");
            _httpClient.DefaultRequestHeaders.Add("Authorization", "Bearer " + token);

            var response = _httpClient.GetAsync(requestUrl);

            if (response.Result.IsSuccessStatusCode)
            {
                var data = response.Result.Content.ReadAsStringAsync();
                resourceGroupModel = ResourceGroupModel.FromJson(data.Result.ToString());
            }
        }
        catch (Exception ex)
        {
        }
        return resourceGroupModel;
    }