For example a Personal Workspace is only available for the currently logged in user.

Administrator can access Admin portal under the Power BI Settings drop down menu by selecting -> "Admin portal"
The ODM Power BI discovery process will return data for all workspaces in the Power BI Service.

Permissions can be updated on workspaces through the portal and this can be used to apply the ODM Power BI module group that contains the service principal for access.

Workspace settings can be viewed in the portal. This can be useful for removing workspaces from a target tenant in cases where a re-migration of a full workspace is required or to removed migrated PoC testing workspaces.