Log in with the Docker ID the subscription was associated with. If the subscription was associated with an organization, you will need to log in with a user account that is a member of the "Owners" team of that organization.
On the My Content page you will notice any active subscriptions that are associated with your Docker ID. If your subscription is associated with an organization, you will need to select the organization from the Account drop down menu in the top right corner of the My Content page. The Account dropdown menu includes any organizations of which your user account is a member of the "Owners" team.
Click the setup button on your subscription to be redirected to the setup instructions page where you can click the License Key link to download your EE license.