A sample of how to obtain a secret value from Azure Key Vault using implicit auth via ADAL and your AD account

AzureKeyVaultSample.cs

using System;
using System.Configuration;
using System.Net.Http;
using System.Threading.Tasks;
using Microsoft.Azure.KeyVault; // Install-Package Microsoft.Azure.KeyVault
using Microsoft.IdentityModel.Clients.ActiveDirectory; // Install-Package Microsoft.IdentityModel.Clients.ActiveDirectory

namespace KeyVaultSample
{
    class Program
    {
        /// <summary>
        /// The Application ID for the app registered with the Azure Active Directory.
        /// </summary>
        /// <remarks>
        /// Register your application in https://portal.azure.com/ within the "App Registrations" blade.
        /// Be sure to grant your app permissions to "Azure Key Vault (AzureKeyVault)".
        /// </remarks>
        private static readonly string ADALClientId = ConfigurationManager.AppSettings.Get("ADALClientId");

        /// <summary>
        /// A URI recorded for the AAD registered app as a valid redirect URI.
        /// </summary>
        /// <remarks>
        /// For example: "https://myapp/finish". Literally, it could be that. You don't need to have a server responding to this URI.
        /// </remarks>
        private static readonly Uri ADALRedirectUri = new Uri(ConfigurationManager.AppSettings.Get("ADALRedirectUri"));

        /// <remarks>
        /// For example: https://yourCoolApp.vault.azure.net/
        /// </remarks>
        private static readonly string KeyVaultAddress = ConfigurationManager.AppSettings.Get("KeyVaultAddress");

        static void Main(string[] args)
        {
            var keyVault = new KeyVaultClient(
                new KeyVaultClient.AuthenticationCallback(GetAccessTokenAsync),
                new HttpClient());
            string secret = keyVault.GetSecretAsync(KeyVaultAddress, "vsazure").Result.Value;
            Console.WriteLine("vsazure secret: " + secret);
        }

        private static async Task<string> GetAccessTokenAsync(string authority, string resource, string scope)
        {
            var context = new AuthenticationContext(authority, TokenCache.DefaultShared);
            AuthenticationResult result;
            try
            {
                // Try to get the token from Windows auth
                result = await context.AcquireTokenAsync(resource, ADALClientId, new UserCredential());
            }
            catch (AdalException)
            {
                try
                {
                    // Try to get the token silently, either using the token cache or browser cookies.
                    result = await context.AcquireTokenAsync(resource, ADALClientId, ADALRedirectUri, new PlatformParameters(PromptBehavior.Never));
                }
                catch (AdalException)
                {
                    // OK, ultimately fail: ask the user to authenticate manually.
                    result = await context.AcquireTokenAsync(resource, ADALClientId, ADALRedirectUri, new PlatformParameters(PromptBehavior.Always));
                }
            }

            return result.AccessToken;
        }
    }
}

AuthenticationCallback not happening. It terminates the process..

I tried this, having set up my APP with these permisssions

I get the following error

Microsoft.IdentityModel.Clients.ActiveDirectory.AdalServiceException: 'AADSTS7000218: The request body must contain the following parameter: 'client_assertion' or 'client_secret'.
Trace ID: 96b0599e-3bac-4fb5-a64e-99180321ce00
Correlation ID: 8f334bd1-d1db-410f-96de-c91b40803c50