SSO Authentication for AWS Workspaces with IAM Identity Center Directory Integration

You can use one of the following options:

• AD Connector — Use your existing on-premises Microsoft Active Directory. Users can sign into their WorkSpaces using their on-premises credentials and access on-premises resources from their WorkSpaces.
• AWS Managed Microsoft AD — Create a Microsoft Active Directory hosted on AWS.
• Simple AD — Create a directory that is compatible with Microsoft Active Directory, powered by Samba 4, and hosted on AWS.
• Cross trust — Create a trust relationship between your AWS Managed Microsoft AD directory and your on-premises domain.

IAM Identity Center is not an option for Workspaces

https://docs.aws.amazon.com/workspaces/latest/adminguide/manage-workspaces-directory.html