GCKey can be used to access multiple Government of Canada online services. Sign in using your existing GCKey account or "Sign up" to create a new account.
When creating a new GCKey account, it will bring you to a page to sign in or create an ISED account. ISED is the owner of the service you are trying to access. It will link the account, grant you access and bring you back to the service you requested once completed.
If you have a GCKey account and forgot your username or recovery questions, you will have to "Sign up" to create a new account and link it to your ISED account.