
By default, when you delete a private channel in the Microsoft Teams, it will delete both the channel and the site that is connected to it.
You could go to SharePoint admin center -> Sites -> Active sites -> Find the site collection associated with the Teams -> Check whether this site collection has channel site.
And you could use following PowerShell to delete a channel site.
#Variables
$AdminSiteURL = "https://tenant-admin.sharepoint.com/"
$SiteCollURL = "https://tenant.sharepoint.com/sites/channelname"
#Connect to sharepoint online
Connect-SPOService -url "https://tenant-admin.sharepoint.com/" -credential (Get-Credential)
#sharepoint online powershell delete site collection
Remove-SPOSite -Identity $SiteCollURL -NoWait -Confirm:$false
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