Hi @procc ,
In my experience, you can manage Teams meeting policy to disable the specific user to create channel meeting. The CsTeamsMeetingPolicy cmdlets enable administrators to control the type of meetings that users can create or the features that they can access while in a meeting. For more details, you can learn it from:
https://learn.microsoft.com/en-us/powershell/module/skype/set-csteamsmeetingpolicy?view=skype-ps
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