A site ID is a unique code to identify your installation of Teradata Database on AWS. Although this site ID is not required to use Teradata Database on AWS, it is required to receive Teradata support. The Developer license tier includes only Community support and does not use site IDs.
When you subscribe to Teradata Database on AWS, you receive a welcome email that enables you to register for support. After registering at http://www.teradata.com/aws/support/, you will receive another email that contains your Master Customer Record, site ID, user ID, and password. Your site ID begins with AWSTDB, followed by 9 characters that the Teradata customer determines.
Existing Teradata customers who have on-premises Teradata systems cannot use their previous site IDs for Teradata Database on AWS. You must obtain a new site ID.