Вы не показываете, как именно вы устанавливаете область, и ошибка может быть связана с этим.
При этом я получаю правильные результаты:
$scopes = [
Google_Service_PeopleService::USER_ADDRESSES_READ,
Google_Service_PeopleService::USER_BIRTHDAY_READ,
Google_Service_PeopleService::PLUS_LOGIN,
Google_Service_PeopleService::USER_EMAILS_READ,
Google_Service_PeopleService::USER_PHONENUMBERS_READ,
];
$client = new Google_Client();
$client->setApplicationName('People API PHP Quickstart');
$client->setAuthConfig('credentials.json');
$client->setAccessType('offline');
$client->setPrompt('select_account consent');
// set the scope
$client->setScopes($scopes);
/* ... actual authentication. */
$service = new Google_Service_PeopleService( $client );
$optParams = [
'personFields' => 'names,emailAddresses,addresses,phoneNumbers',
];
$me = $service->people->get( 'people/me', $optParams );
print_r( $me->getNames() );
print_r( $me->getEmailAddresses() );
print_r( $me->getBirthdays() );
print_r( $me->getPhoneNumbers() );