Using

static void Main(string[] args)
{
    // Create CDN client using token credentials generated from an authentication result
    CdnManagementClient cdn = new CdnManagementClient(new TokenCredentials(authResult.AccessToken))
    {
        SubscriptionId = subscriptionId
    };
}

private static void ListProfilesAndEndpoints(CdnManagementClient cdn, string resourceGroupName)
{
    // List all the CDN profiles in the specified resource group
    var profileList = cdn.Profiles.ListByResourceGroup(resourceGroupName);
    foreach (Profile p in profileList)
    {
        Console.WriteLine("CDN profile: {0}", p.Name);

        // List all the CDN endpoints for the current profile
        Console.WriteLine("Endpoints:");
        var endpointList = cdn.Endpoints.ListByProfile(p.Name, resourceGroupName);
        foreach (Endpoint e in endpointList)
        {
            Console.WriteLine(" - {0} ({1})", e.Name, e.HostName);
        }
        Console.WriteLine();
    }
}

static async Task Main(string[] args)
{
    var cdnClient = new CdnManagementClient(serviceClientCredentials)
    {
        SubscriptionId = "5487d26-b51b-468e-ad45-6e12acfc7e7"
    };

    ListProfilesAndEndpoints(cdnClient, "rg-az2204-cdn");
}

static void ListProfilesAndEndpoints(CdnManagementClient cdnClient, string resourceGroupName)
{
    // List all the CDN profiles in the specified resource group
    var profileList = cdnClient.Profiles.ListByResourceGroup(resourceGroupName);
    foreach (Profile p in profileList)
    {
        Console.WriteLine($"CDN profile: {p.Name}");
        Console.WriteLine("Endpoints:");
        var endpointList = cdnClient.Endpoints.ListByProfile(p.Name, resourceGroupName);
        foreach (Endpoint e in endpointList)
        {
            Console.WriteLine($" - {e.Name} ({e.HostName})");
        }
        Console.WriteLine();
    }
}

CdnManagement  dotnet run
CDN profile: happylearning-cdn
Endpoints:
 - happylearning (happylearning.azureedge.net)