I try to get my keyvalue stored in akv via this code

    HttpClient client = new HttpClient();
    string keyVaultName = !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("web-kv")) ? Environment.GetEnvironmentVariable("web-kv") : throw new ArgumentNullException("web-kv");
    string kvUri = "https://" + keyVaultName + ".vault.azure.net";
    bool success = Uri.TryCreate(kvUri, UriKind.Absolute, out Uri uri);
    if(!success)
    {
        throw new Exception(kvUri);
    }
        var akvClient = new SecretClient(new Uri(kvUri), new DefaultAzureCredential());
        var apiKey = akvClient.GetSecret("LicenseApiKey");

Which returns this exception

Azure.Identity.AuthenticationFailedException: The DefaultAzureCredential failed to retrieve a token from the included credentials.
  EnvironmentCredential is unavailable Environment variables not fully configured. AZURE_TENANT_ID and AZURE_CLIENT_ID must be set, along with either AZURE_CLIENT_SECRET or AZURE_USERNAME and AZURE_PASSWORD. Currently set variables [  ].
  ManagedIdentityCredential is unavailable No managed identity endpoint found..
  SharedTokenCacheCredential is unavailable No accounts were discovered in the shared token cache. To fix, authenticate through tooling supporting azure developer sign on..