Unable to set tags

[RobertBoes]

I'm unable to set the learner tags with the API. The API gives a OK response (<rsp stat="ok"><success /></rsp>), but the tags are not set in the SCORM cloud environment. I'm using the (pseudo) code below:

// Setup SCORM API
$scormService = new ScormEngineService(
  'http://cloud.scorm.com/EngineWebServices',
  $scormCloudAppId,
  $scormCloudSecretKey,
  $scormCloudOrigin
);

$invitationService = $scormService->getInvitationService();
$taggingService = $scormService->getTaggingService();
$registrationService = $scormService->getRegistrationService();

// Some variables
$email = '[email protected]';
...
$lastname = 'example';

// Create invite and update the registration
$response = $invitationService->CreateInvitation($courseId, 'false', 'true', $email, $emailSubject, $body, $creatingUserEmail);
$response = $registrationService->UpdateLearnerInfo($email, $firstname, $lastname);

// Adding a tag and echo if the status was OK
$response = $taggingService->AddLearnerTag($email, 'some,tags');
$xml = new SimpleXMLElement($response);
if (isset($xml['stat']) && $xml['stat'] == 'ok') {
    echo 'Tags added';
}