In large Microsoft 365 environments, leadership and governance teams often need visibility into collaboration resources owned by a specific organization unit – typically defined by a manager and their reporting chain. Native tools make it easy to inspect a single Team or site, but not to answer a simple question at scale: “What Teams and SharePoint sites are owned by anyone under this leader?” This PowerShell script builds that inventory by expanding a manager’s hierarchy and correlating owners to Microsoft 365 Groups/Teams and their associated SharePoint sites.