I can’t get the Contacts data in the sandbox.

With these settings, I get records from the live account

private $configuration = [
    'client_id'              => '1000.AAA',
    'client_secret'          => 'BBB',
    'redirect_uri'           => 'CCC',
    'currentUserEmail'       => 'DDD',
    'token_persistence_path' => './',
];

$contacts = ZCRMModule::getInstance("Contacts")->getRecords();

Result: array of Contacts.

With these settings, I do not get records from the sandbox

private $configuration = [
    'client_id'              => '1000.AAA',
    'client_secret'          => 'BBB',
    'redirect_uri'           => 'CCC',
    'currentUserEmail'       => 'DDD',
    'token_persistence_path' => './',
     //sandbox params
    'sandbox'                => true,
    'domainSuffix'           => 'com',
    'iamURL'                 => 'https://accounts.zoho.com/',
    'apiBaseUrl'             => 'https://sandbox.zohoapis.com',
];

$contacts = ZCRMModule::getInstance("Contacts")->getRecords();

Result: empty array, but demo data in the sandbox in the Contacts section exists.

What could be the problem?