Function App getting key vault secret

Function1.cs

using System;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Host;
using Microsoft.Azure.KeyVault;
using Microsoft.IdentityModel.Clients.ActiveDirectory;
using System.Threading.Tasks;
using System.Security.Cryptography.X509Certificates;

namespace KeyVaulfFunc
{
    public static class Function1
    {
        private const string applicationId = "Your Application ID";
        private const string cerificateThumbprint = "You certificate thumbprint";

        [FunctionName("Function1")]
        public async static Task Run([TimerTrigger("0 */5 * * * *")]TimerInfo myTimer, TraceWriter log)
        {
            log.Info($"C# Timer trigger function executed at: {DateTime.Now}");

            var keyVaultClient = new KeyVaultClient(async (authority, resource, scope) =>
            {
                var authenticationContext = new AuthenticationContext(authority, null);
                X509Certificate2 certificate;
                X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
                try
                {
                    store.Open(OpenFlags.ReadOnly);
                    X509Certificate2Collection certificateCollection = store.Certificates.Find(X509FindType.FindByThumbprint, cerificateThumbprint, false);
                    if (certificateCollection == null || certificateCollection.Count == 0)
                    {
                        log.Info($"Certificate not installed in the store");
                        throw new Exception("Certificate not installed in the store");
                    }
                    certificate = certificateCollection[0];
                }
                finally
                {
                    store.Close();
                }
                var clientAssertionCertificate = new ClientAssertionCertificate(applicationId, certificate);

                var result = await authenticationContext.AcquireTokenAsync(resource, clientAssertionCertificate);
                var token = result.AccessToken;
                return token;
            });

            var secretIdentifier = "https://blogkv123.vault.azure.net/secrets/SQLPassword/";
            var secret = await keyVaultClient.GetSecretAsync(secretIdentifier);

            log.Info($"My secret is: {secret.Value}");
        }
    }
}

gistfile1.txt

using System;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Host;
using Microsoft.Azure.KeyVault;
using Microsoft.IdentityModel.Clients.ActiveDirectory;
using System.Threading.Tasks;
using System.Security.Cryptography.X509Certificates;

namespace KeyVaulfFunc
{
    public static class Function1
    {
        private const string applicationId = "...";
        private const string cerificateThumbprint = "...";

        [FunctionName("Function1")]
        public async static Task Run([TimerTrigger("0 */5 * * * *")]TimerInfo myTimer, TraceWriter log)
        {
            log.Info($"C# Timer trigger function executed at: {DateTime.Now}");

            var keyVaultClient = new KeyVaultClient(async (authority, resource, scope) =>
            {
                var authenticationContext = new AuthenticationContext(authority, null);
                X509Certificate2 certificate;
                X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
                try
                {
                    store.Open(OpenFlags.ReadOnly);
                    X509Certificate2Collection certificateCollection = store.Certificates.Find(X509FindType.FindByThumbprint, cerificateThumbprint, false);
                    if (certificateCollection == null || certificateCollection.Count == 0)
                    {
                        log.Info($"Certificate not installed in the store");
                        throw new Exception("Certificate not installed in the store");
                    }
                    certificate = certificateCollection[0];
                }
                finally
                {
                    store.Close();
                }
                var clientAssertionCertificate = new ClientAssertionCertificate(applicationId, certificate);

                var result = await authenticationContext.AcquireTokenAsync(resource, clientAssertionCertificate);
                var token = result.AccessToken;
                return token;
            });

            var secretIdentifier = "https://blogkv123.vault.azure.net/secrets/SQLPassword/";
            var secret = await keyVaultClient.GetSecretAsync(secretIdentifier);

            log.Info($"My secret is: {secret.Value}");
        }
    }
}