How to Use PowerShell to Identify Inactive Teams Channels
It’s common to find that tenants have many inactive channels in their Teams deployment. Becoming inactive is a natural side-effect of time eroding interest in the topics people discuss in channels. And if you don’t go looking for inactive channels, they’ll remain silently in place doing nothing except acting as a container for potentially obsolete long-over discussions. But we can find inactive channels with PowerShell. What you next is up to you.