通常，如果项目ID不正确或该项目的身份验证失败，就会发生这种情况。
您可以检查此public documentation作为指导。

我在recaptcha的sdk中找到了一个注解方法。这在任何地方都没有记录。

use Google\Cloud\RecaptchaEnterprise\V1\AnnotateAssessmentRequest\Annotation;
use Google\Cloud\RecaptchaEnterprise\V1\AnnotateAssessmentResponse;
use Google\Cloud\RecaptchaEnterprise\V1\RecaptchaEnterpriseServiceClient;

require 'vendor/autoload.php';

$assessment = 'YOUR ASSESSMENT ID'; // /projects/PROJECT_ID/assessments/ASSESSMENT_ID
try {
    $client = new RecaptchaEnterpriseServiceClient([
        'credentials' => __DIR__.'/../vault/'.RECAPTCHA_SERVICE_CREDEN
    ]);

  $client->annotateAssessment($assessment, 1); // 1 = Legitimate, 2 = Fraudulent

} catch (Exception $e){
    $response['error'] = 'An error occurred: '.$e->getMessage();
}