code: def query_subscriptions(self, subscription_query):
          
          content = self._serialize.body(subscription_query, 'SubscriptionQuery')
          response = self._send(http_method='POST',
                                location_id='6864db85-08c0-4006-8e8e-cc1bebe31675',
                                version='5.0-preview.1',
                                content=content)
          return self._deserialize('[NotificationSubscription]', self._unwrap_collection(response))
docs: QuerySubscriptions.
          [Preview API] Query for subscriptions. A subscription is returned if it matches one or more of the specified conditions.
          :param :class:`<SubscriptionQuery> <azure.devops.v5_0.notification.models.SubscriptionQuery>` subscription_query:
          :rtype: [NotificationSubscription]