def METHOD_NAME(self, logger: AirbyteLogger, config: Mapping[str, Any]) -> Tuple[bool, Optional[Any]]:
    try:
        config = self._validate_and_transform(config)
        authenticator = self.get_authenticator(config)
        kwargs = {"authenticator": authenticator, "domain": config["domain"], "projects": config["projects"]}
        labels_stream = Labels(**kwargs)
        next(read_full_refresh(labels_stream), None)
        # check projects
        projects_stream = Projects(**kwargs)
        projects = {project["key"] for project in read_full_refresh(projects_stream)}
        unknown_projects = set(config["projects"]) - projects
        if unknown_projects:
            return False, "unknown project(s): " + ", ".join(unknown_projects)
        return True, None
    except (requests.exceptions.RequestException, ValidationError) as e:
        return False, e