Can't send app request, apparently sent but do not appear notifying users

Question

I'm having trouble getting users to forward the App request to his friends;

I'm using the next code in client-side:

window.fbAsyncInit = function() {
    FB.init({
        appId: 'FBAPPD',
        frictionlessRequests: true,
        status     : true,
        cookie     : true,
        xfbml      : true
    });
};

When the users selects her friends:

function sendRequestToRecipients() {
var user_ids = document.getElementById("request_ids").value; //ID_user1,ID_user2...
 FB.ui({
        method: 'apprequests',
        message: 'Prueba una nueva forma de comunicarte con tus contactos...',
        to: '' + user_ids + '',
    }, requestCallback);

function requestCallback(response) {
// Handle callback here
    if (response.request && response.to) 
    {
        var request_ids = [];
        for(i=0; i<response.to.length; i++) {
            var temp = response.request + '_' + response.to[i];
            request_ids.push(temp);
        }
        var requests = request_ids.join(',');
        $.post('/FB_Invitaciones', { uid: document.getElementById("FBUser").value, request_ids: requests }, function (resp) {
            // callback after storing the requests
        });
    } else 
    {
        alert('canceled');
    }
}

Server Side

<?php
[...]
    $token_url = "https://graph.facebook.com/oauth/access_token?" .
        "client_id=" . $FBAPPID .
        "&client_secret=" . $FBSECRETFBAPPID .
        "&grant_type=client_credentials";

    $app_access_token = file_get_contents($token_url);

    $user_id = $datos->getFBID();

    //Procesando ids 
    $ids = explode(",",$_REQUEST['request_ids']);

    foreach($ids as $request)
    {
        $apprequest_url ="https://graph.facebook.com/" .$request.
            "?".$app_access_token;
        $result = file_get_contents($apprequest_url);
    }
die()
?>

I can not find the error.

Thanks for the help

Answer 1

I'm found a solution in this question: send app request works, but not sent to user? In my case in the App Configuration I need check "App on Facebook" and now works fine