我在我的program.cs文件中添加以下代码

public class Program 

{ 
public static void Main(string[] args) 
{ 

CreateHostBuilder(args).Build().Run(); 

} 
public static IHostBuilder CreateHostBuilder(string[] args) => 
Host.CreateDefaultBuilder(args) 
.ConfigureWebHostDefaults(webBuilder => 
{
 webBuilder.UseStartup<Startup>(); 

}) 
.ConfigureAppConfiguration((context, config) => 

{

 var builtConfig = config.Build(); 
var vaultName = builtConfig["keyvault"]; 

var keyVaultClient = new KeyVaultClient( 

async (authoriy, resource, scope) => 

{ 

var credential = new DefaultAzureCredential(false);
 
var token = credential.GetToken( 
new TokenRequestContext( new[] {"https://vault.azure.net/.default" } 
) 

); 

return token.Token; }); 

config.AddAzureKeyVault( 

vaultName, keyVaultClient, 
new DefaultKeyVaultSecretManager());

 });

我所做的正是从密钥库中获取值，该密钥库位于www.example.com中ASP.net，但出现异常未处理的错误。
Microsoft.Azure.KeyVault.Models.KeyVaultErrorException：'操作返回了无效的状态代码'Not Found'
检索值后，我需要在logicapps中执行keyvault工作流。
请帮助我解决我的错误。