is_user_logged_in() return false even when logged in to WordPress?

I have a plugin that I created and I want to use the WP rest api controller pattern and extend the api.

<?php
/**
* Plugin Name: myplugin
* Plugin URI: h...
* Description: A simple plugin ...
* Version: 0.1
* Author: Kamran ...
* Author ....
* License: GPL2

function myplugin_register_endpoints(){

  require_once 'server/controllers/my_ctrl.php';
  $items=new items();
  $items->register_routes();

}

add_action('rest_api_init','myplugin_register_endpoints'); . .

I created a class in folder called server/controllers and inside it my_ctrl.php file with a class that extends WP_REST_Controller that looks like this

<?php

class items extends WP_REST_Controller {

  /**
  * Register the routes for the objects of the controller.
  */

  public function register_routes() {
    $version = '1';
    $namespace = 'my-namespase/v' . $version;
    $base = 'abc';

    register_rest_route( $namespace, '/' . $base, array(
        array(
            'methods'         => WP_REST_Server::READABLE,
            'callback'        => array( $this, 'get_items' ),
            'permission_callback' => array( $this, 'get_items_permissions_check' ),
            'args' => array(
                'id' => array(
                    'required' => true,
                    'validate_callback' => function($param, $request, $key) {
                        return is_numeric( $param ) and ! is_null(get_post($param));//numeric post id value and there is valid post for this id
                    },
                    'sanitize_calback' => 'absint'
                )
            ),
        ),

    ) );

    register_rest_route( $namespace, '/' . $base . '/(?P<id>[\d]+)', array(
        array(
            'methods'         => WP_REST_Server::CREATABLE,
            'callback'        => array( $this, 'create_item' ),
            'permission_callback' => array( $this, 'create_item_permissions_check' ),
            'args' => array(
                'id' => array(
                    'required' => true,
                    'validate_callback' => function($param, $request, $key) {
                        return is_numeric( $param ) and ! is_null(get_post($param));//numeric post id value and there is valid post for this id
                    },
                    'sanitize_calback' => 'absint'
                )
            ),
        ),
        array(
            'methods'  => WP_REST_Server::DELETABLE,
            'callback' => array( $this, 'delete_item' ),
            'permission_callback' => array( $this, 'delete_item_permissions_check' ),
            'args' => array(
                'id' => array(
                    'required' => true,
                    'validate_callback' => function($param, $request, $key) {
                        return is_numeric( $param ) and ! is_null(get_post($param));//numeric post id value and there is valid post for this id
                    },
                    'sanitize_calback' => 'absint'
                )
            ),
        ),
    ) );

    register_rest_route( $namespace, '/' . $base . '/schema', array(
        'methods'         => WP_REST_Server::READABLE,
        'callback'        => array( $this, 'get_public_item_schema' ),
    ) );

}

function get_items( $request ){
    return new WP_REST_Response( array('message' => "list items"), 200 );
}

function create_item( $request ) {
    .....
    if($author_email==$user_email) {

        return new WP_REST_Response( array('message' => 'success', 200 );

    } else {

       return new WP_Error('my-error', __(' error...','abc'), array( 'status' => 500 ));
    }
}

//Remove vote////////////////////////////////////////////
function delete_item( $request ) {
    ...
    if($author_email==$user_email) {

        return new WP_REST_Response( array('message' => 'success', 200 );

    } else {

       return new WP_Error('my-error', __(' error...','abc'), array( 'status' => 500 ));
  }

}

public function get_items_permissions_check( $request ) {
    return true;
}

public function create_item_permissions_check( $request ) {

    if ( !is_user_logged_in()) {
        return new WP_Error('login error',__('You are not logged in','KVotes-voting'));
    }
    return true;

}

public function delete_item_permissions_check( $request ) {
    return $this->create_item_permissions_check( $request );
}

protected function prepare_item_for_database( $request ) {
    return array();
}

public function prepare_item_for_response( $item, $request ) {
    return array();
}

public function get_collection_params() {
    return array(
        'page'                   => array(
            'description'        => 'Current page of the collection.',
            'type'               => 'integer',
            'default'            => 1,
            'sanitize_callback'  => 'absint',
        ),
        'per_page'               => array(
            'description'        => 'Maximum number of items to be returned in result set.',
            'type'               => 'integer',
            'default'            => 10,
            'sanitize_callback'  => 'absint',
        ),
        'search'                 => array(
            'description'        => 'Limit results to those matching a string.',
            'type'               => 'string',
            'sanitize_callback'  => 'sanitize_text_field',
        ),
    );
}

}

I am logged in and I am using cookie authentication with Nonce in my plugin. when I run my code and debug it with sublime xdebug extension I can see that I indeed hit the end points but although I am logged it in the lines: "is_user_logged_in()" = (bool) 0 and therefore the function create_item_permissions_check return new WP_Error(....);and not true;

therefore my rest callback "create_item" is not invoked, I don't understand why is_user_logged_in() return false even when I am logged in.

via Chebli Mohamed