Using AzureServiceTokenProvider to fetch the Access Token for Key Vault

HomeContraoller.cs

public async Task<IActionResult> Index()
{
	var vaultName = _configuration["AppSettings:KeyVaultName"];
	var secretName = _configuration["AppSettings:SecretName"];

	var vm = new HomeViewModel();

	try
	{
		// Creating the Key Vault client
		var tokenProvider = new AzureServiceTokenProvider();
		var vaultClient = new KeyVaultClient(new KeyVaultClient.AuthenticationCallback(tokenProvider.KeyVaultTokenCallback));

		// Get the secret
		var secret = await vaultClient.GetSecretAsync($"https://{vaultName}.vault.azure.net/secrets/{secretName}");
    
		vm.SecretValue = secret.Value;
	}
	catch (Exception ex)
	{
		vm.IsError = true;
		vm.ErrorMessage = ex.Message;
	}

	return View(vm);
}