This issue has been resolved. Your Client ID should be working normally.
Please let us know if you are still having issue making queries.
Hello Gracenote Developers,
We are currently having an issue rendering new Client ID registrations. This is causing all newly created Client IDs not being recognized by our service and therefore not being able to make successful queries. I will update this post once we make progress fixing the issue. Thank you for your patience and understanding.
Gracenote Developer Team