Some new and updated cmdlets in a new version of the Teams PowerShell module are available to support private channels. The cmdlets and parameters are pretty straightforward for anyone used to working with Teams through PowerShell. Remember to read up and understand all about private channels before trying to work with them through PowerShell.
https://office365itpros.com/2019/11/19/teams-updates-powershell-module-private-channels/
