System.ArgumentOutOfRangeException List of configured name servers must not be empty. Parameter name: servers

I have upgraded the `Microsoft.Extensions.Configuration.AzureAppConfiguration` nuget package from 6.0.0 to 8.0.0 now I am getting the below crash from our clients.

```
`async Task LookupClient.QueryInternalAsync(DnsQuestion question, DnsQuerySettings queryOptions, IReadOnlyCollection servers, CancellationToken cancellationToken)
In App
Assembly:DnsClient Version:1.7.0.0 PublicKeyToken:4574bb5573c51424`
Called from: async Task> SrvLookupClient.InternalQueryAsync(string srvDns, CancellationToken cancellationToken)
async Task> SrvLookupClient.QueryAsync(string host, CancellationToken cancellationToken)
async Task ConfigurationClientManager.RefreshFallbackClients(CancellationToken cancellationToken)
async Task ConfigurationClientManager.DiscoverFallbackClients()

System.ArgumentOutOfRangeException: List of configured name servers must not be empty.
Parameter name: servers
Exception fatal 08:56:28.941 PM
A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread.
```
Below is the CDN configuration, we are connecting the feature flag via CDN link
```
private const string DefaultConnectionString = "Endpoint=https://xxxxxx-edge.azureedge.net;Id=0;Secret=MA==";

configurationBuilder.AddAzureAppConfiguration(options =>
{
// To connect with feature flag CDN edge.
options.Connect(this.connectionString);
options.UseFeatureFlags(config => config.SetRefreshInterval(this.Configuration.ConfigurationRefreshInterval));
this.configurationRefresher = options.GetRefresher();
}, true);

var serviceCollection = new ServiceCollection();
serviceCollection.Configure(options =>
{
options.IgnoreMissingFeatures = false;
// The 'IgnoreMissingFeatureFilters' flag cannot be used in combination with a feature of requirement type 'All'.
options.IgnoreMissingFeatureFilters = false;
});

serviceCollection.AddSingleton(configuration)
.AddFeatureManagement()
.AddFeatureFilter()
.AddFeatureFilter();

var seviceProvider = serviceCollection.BuildServiceProvider();
this.featuremanager = seviceProvider.GetService();

```
During the initialization of SDK throws the above exception.

Could you please let me know how do I fix this issue? I also see the latest version 8.2.0, is it fixed in the latest version?

Thanks,
Sathishkumar