def METHOD_NAME(self, user_id_list, unknown_users, created_id_list, existing_id):
    return (
        f'Attempted to create for: {user_id_list}\n' +
        f'Could not find: {unknown_users}\n' +
        f'Created External IDs for: {created_id_list}\n' +
        f'External IDs already exist for: {existing_id}\n'
    )