def admin_confirm_sign_up(self, username=None):
        """
        Confirms user registration as an admin without using a confirmation
        code. Works on any user.
        :param username: User's username
        :return:
        """
        if not username:
            username = self.username
        self.client.admin_confirm_sign_up(
            UserPoolId=self.user_pool_id,
            Username=username,
        )