Accessing your QCC subscription shows the following error message:
Subscription already consumed.
If you are the user that consumed the subscription, go to qcc.qlik.com to log into the learning platform.

Resolution
Go to https://qcc.qlik.com/ and make certain you are logged in with your Qlik ID.
If you have accessed the page from the registration email, the error is expected as the link is only intended to be used for registration purposes.