Having problems retrieving messages: Using StropheJS and MAM on ejabberd. Returns 403.

          var id = CONNECTION.getUniqueId();

          var attrs = { 'type' : 'set'};
          attrs.to = options['with'];

          var stanza = $iq(attrs).c('query', { 'xmlns' : Strophe.NS.MAM } );

          stanza.c('x',
            {
              'xmlns': Strophe.NS.XFORM,
              'type': 'submit'
            })
            .c('field',
              {
                'var':'FORM_TYPE',
                'type': 'hidden'
              }
            )
            .c('value').t(Strophe.NS.MAM).up().up();

          stanza.c('field', {'var':'with'}).c('value').t(options['with']).up().up();

          $.each(['start', 'end'], function (i, t) {
              if (options[t]) {
                  date = moment(options[t]);
                  if (date.isValid()) {
                      stanza.c('field', {'var':t}).c('value').t(date.format()).up().up();
                  } else {
                      throw new TypeError('archive.query: invalid date provided for: '+t);
                  }
              }
          });

          stanza.up();

          if (options instanceof Strophe.RSM) {
            stanza.cnode(options.toXML());
          } else if (_.intersection(RSM_ATTRIBUTES, _.keys(options)).length) {
            stanza.cnode(new Strophe.RSM(options).toXML());
          }

          CONNECTION.addHandler(function (message) {
            var $msg = $(message), $fin, rsm, i;

            if (typeof callback == "function") {
              $fin = $msg.find('fin[xmlns="'+Strophe.NS.MAM+'"]');

              if ($fin.length) {
                  rsm = new Strophe.RSM({xml: $fin.find('set')[0]});
                  _.extend(rsm, _.pick(options, ['max']));
                  _.extend(rsm, _.pick(options, MAM_ATTRIBUTES));
                  callback(messages, rsm);

                  return false; // We've received all messages, decommission this handler
              } else if (queryid == $msg.find('result').attr('queryid')) {
                  messages.push(message);
              }
              return true;
            } else {
              return false; // There's no callback, so no use in continuing this handler.
            }
          }, Strophe.NS.MAM);

          CONNECTION.sendIQ(stanza, null, function (e) {
            console.error('e', e);
          });