Azure API Authentication Exception

When I run this, I get an exception saying the request can't be authenticated.  The exception also mentions a certificate, but not sure what certificate it's referring to Anyone experience this issue?

static void Main(string[] args)
{
       const string subscriptionId = "XXXXX-XXXXXX-XXXXXX-XXXXX";

       var token = GetAuthorizationHeader();
       var credential = new TokenCloudCredentials(subscriptionId, token);

       // This will throw Microsoft.WindowsAzure.CloudException
       CreateStorageAccountAsync(credential).Wait();
}

static string GetAuthorizationHeader()
{
	// These URLs have been stripped from the code sample because forum won't let me post links.
       const string apiEndPoint = @"";
       string azureAuthEndPoint = @"";
       string clientId = @"XXXXXXXXXX-XXXXXX-XXXXXXXXX";
       string clientSecret = @"XXXXXXXXXXXXXXXXXXXXXXXXXX";

       var context = new AuthenticationContext(azureAuthEndPoint);
       var clientCred = new ClientCredential(clientId, clientSecret);

       var result = context.AcquireToken(apiEndPoint, clientCred);

       if (result == null)
       {
              throw new InvalidOperationException("Failed to obtain the JWT token");
       }

       string token = result.AccessToken;
       return token;
}

static async Task<string> CreateStorageAccountAsync(SubscriptionCloudCredentials credentials)
{
       using (var storageClient = new StorageManagementClient(credentials))
       {
              await storageClient.StorageAccounts.CreateAsync(
                    new StorageAccountCreateParameters
                    {
                           Label = "Sample Storage Account",
                           Location = LocationNames.WestUS,
                           Name = "somerandomname"
                    });
       }
       return "Successfully created account.";
}

System.AggregateException
was unhandled

  HResult=-2146233088

  Message=One or more errors occurred.

  Source=mscorlib

  StackTrace:

       at System.Threading.Tasks.Task.Wait(Int32
millisecondsTimeout, CancellationToken cancellationToken)

       at System.Threading.Tasks.Task.Wait()

       at AzureCreateRelay.Program.Main(String[]
args) in d:\company\next03\shared\online\source\DevOps\Azure\AzureCreateRelay\Program.cs:line
23

       at
System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)

       at
Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()

       at
System.Threading.ExecutionContext.RunInternal(ExecutionContext
executionContext, ContextCallback callback, Object state, Boolean
preserveSyncCtx)

       at
System.Threading.ExecutionContext.Run(ExecutionContext executionContext,
ContextCallback callback, Object state, Boolean preserveSyncCtx)

       at
System.Threading.ExecutionContext.Run(ExecutionContext executionContext,
ContextCallback callback, Object state)

       at
System.Threading.ThreadHelper.ThreadStart()

  InnerException: Microsoft.WindowsAzure.CloudException

       HResult=-2146233088
       Message=ForbiddenError: The server failed to authenticate the request. Verify that the certificate is valid and is associated with this subscription.

       Source=Microsoft.Threading.Tasks

       ErrorCode=ForbiddenError

       ErrorMessage=The server failed to
authenticate the request. Verify that the certificate is valid and is
associated with this subscription.

       StackTrace:

            at
Microsoft.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

            at Microsoft.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccess(Task
task)

            at
Microsoft.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)

            at
Microsoft.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()

            at
Microsoft.WindowsAzure.Management.Storage.StorageAccountOperations.<CreateAsync>d__25.MoveNext()

         --- End of stack trace from
previous location where exception was thrown ---

            at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

            at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task)

            at
System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()

            at
AzureCreateRelay.Program.<CreateStorageAccountAsync>d__1.MoveNext() in
d:\company\next03\shared\online\source\DevOps\Azure\AzureCreateRelay\Program.cs:line
51

       InnerException: <o:p></o:p>