How to Restrict the Creation of Regular Microsoft Teams Channels

 

No Teams administration policy controls the creation of regular channels. Policies are there to control the creation of shared and private channels, but not the regular variety. Team owners can restrict creation on a team-by-team basis, but if organizations want to apply central control, they’ll need to do it with PowerShell.

https://office365itpros.com/2022/08/30/teams-channel-creation-control/