Amazon QuickSight now supports account instances of IAM Identity Center when creating a new subscription to QuickSight. Administrators can sign up for QuickSight and choose an account instance of IAM Identity Center that exists in the same AWS account as their QuickSight subscription. Account instances support isolated deployments of applications in a single AWS account, leveraging IAM Identity Center workforce identity and access portal features. Account instances are bound to a single AWS account and are used only to manage user and group access for applications in the same account and AWS region.
Source:: Amazon AWS