def get_storage_key(self, context: TurnContext) -> str:
        """
        Returns the storage key for the current user state.
        :param context:
        :return:
        """
        activity = context.activity
        channel_id = getattr(activity, 'channel_id', None)
        user_id = getattr(activity.from_property, 'id', None) if hasattr(activity, 'from_property') else None

        storage_key = None
        if channel_id and user_id:
            storage_key = "%s/users/%s" % (channel_id, user_id)
        return storage_key
Returns the storage key for the current user state.
        :param context:
        :return: