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This following php script return if is correct or incorrect the username and password and save the session with my_setcookie working perfectly in localhost, but in production just  return if is correct or incorrect the username and password and BUT NOT save the session, if I reload the page not saved the session
 

function login($info,$resultadoint=0){
		global $plugins,$mybb,$db,$templates,$config;
		$datos=explode("|",$info);
		$inline_errors = "";
		$plugins->run_hooks("member_do_login_start");
		// Is a fatal call if user has had too many tries
		$errors = array();
		$logins = login_attempt_check();
		require_once "./InteractU/inc/functions_user.php";
		require_once "./InteractU/inc/datahandlers/login.php";
		$loginhandler = new LoginDataHandler("get");
		$user = array(
			'username' => $datos[0],
			'password' => $datos[1],
			'remember' => "yes",
			'imagestring' => ""
		);
		$user_loginattempts = get_user_by_username($user['username'], array('fields' => 'loginattempts'));
		$user['loginattempts'] = (int)$user_loginattempts['loginattempts'];
		$loginhandler->set_data($user);
		$validated = $loginhandler->validate_login();
		if($validated==1){
			$mybb->user = get_user($loginhandler->login_data['uid']);
			my_setcookie("mybbuser", $mybb->user['uid']."_".$mybb->user['loginkey'], null, false, "lax");
			$usuario=$mybb->user['username'];
			$logout=md5($mybb->user['loginkey']);
			/*if($mybb->user['usergroup']==4){
				eval('$adminpanelvinc= "'.$templates->get('TD_ajax_adminvinc').'";');				
			}*/
			$adminpanelvinc="";
			eval('$resultado= "'.$templates->get('SP_HTML_Head_Logeado').'";');
			/*if($resultadoint==1){
				$resultado=2;	
			}*/
		}else{
			$db->update_query("users", array('loginattempts' => 'loginattempts+1'), "LOWER(username) = '".$db->escape_string(my_strtolower($user['username']))."'", 1, true);
			$user_loginattempts = get_user_by_username($user['username'], array('fields' => 'loginattempts'));
			$user['loginattempts'] = (int)$user_loginattempts['loginattempts'];
			if($user['loginattempts']<5){
				$resultado=0;
			}
			if($user['loginattempts']>5){
				$resultado=1;	
			}
		}
		return $resultado;
	}

Also tried with

	function login($info,$resultadoint=0){
		global $db, $templates, $mybb, $session, $settings, $mybbgroups, $user, $config;
		$datos=explode("|",$info);
		$errors = array();
		$logins = login_attempt_check(1);
		//require_once "./InteractU/inc/datahandlers/login.php";
		//$loginhandler = new LoginDataHandler("get");
		require_once "./InteractU/inc/functions_user.php";

		$query = $db->simple_select("users", "loginattempts", "LOWER(username)='".$db->escape_string(my_strtolower($datos[0]))."'", array('limit' => 1));
		$loginattempts = $db->fetch_field($query, "loginattempts");
		if($loginattempts > 5 || intval($mybb->cookies['loginattempts']) > 5){
			$resultado=1;
		}
    	$user = validate_password_from_username($datos[0], $datos[1]);
		if (!$user['uid']) {
 			my_setcookie('loginattempts', $logins + 1);
			$db->write_query("UPDATE ".TABLE_PREFIX."users SET loginattempts=loginattempts+1 WHERE username = '".$datos[0]."'");
			$resultado=0;
		} else {
			//This function is give me a error.
			//$loginhandler->complete_login();
 			$options = array('fields' => array('uid', 'username', 'password', 'salt', 'loginkey'));
            $usuario_info = get_user_by_username($datos[0], $options);
            //$usuario=$usuario_info['loginkey'];
		    $usuario=$datos[0];
			$logout=md5($usuario_info['loginkey']);
		    my_setcookie('loginattempts', 1);
     		$db->update_query("users", array("loginattempts" => 1), "uid='{$usuario_info['uid']}'");
     		// Delete old session entry
     		$db->delete_query("sessions", "ip='" . $db->escape_string($session->ipaddress) . "' AND sid != '" . $session->sid . "'");
     		// Create a new session and save it in the database
     		$newsession = array("uid" => $usuario_info['uid']);
     		$db->update_query("sessions", $newsession, "sid='" . $session->sid . "'");
     		// Temporarily set the cookie remember option for the login cookies
     		//$mybb->user['remember'] = $user['remember'];
     		// Set essential login cookies
     		/*
     		$remember = null;
			if(!isset($mybb->input['remember']) || $mybb->input['remember'] != "yes")
			{
				$remember = -1;
			}
			my_setcookie("mybbuser", $usuario_info['uid']."_".$usuario_info['loginkey'], null, false, "lax");
     		//if($this->sid && (!isset($mybb->cookies['sid']) || $mybb->cookies['sid'] != $this->sid) && $this->is_spider != true)
			//{
			my_setcookie("sid", $session->sid, true, true);
			//}
		    $resultado=$usuario_info['loginkey'];
			eval('$resultado= "'.$templates->get('SP_HTML_Head_Logeado').'";');
    	}
		return $resultado;
	}

Best regards