Setup: O365 tenant with Teams

Problem: There is a private channel in a Team that is orphan – last owner left and no other user is part of that channel

Solution: Run the following PowerShell commands

 Connect-MicrosoftTeams
Get-Team -DisplayName "Name of the Team"
# take note of the GroupId and replace it the below command
Add-TeamChannelUser -GroupId xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx -DisplayName "<Channel name>" -User [email protected]
 Add-TeamChannelUser -GroupId xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx -DisplayName "<Channel name>" -User [email protected] -Role Owner

OBS. You need to run both commands in this order.

To change the owner of the SharePoint site associated with the channel:

Identify the site URL using this instructions: List all private channel’s SharePoint sites in a tenant

$SiteCollURL = "https://tenant.sharepoint.com/sites/TEAM-Channel"
$SiteOwner = "[email protected]"
Set-SPOSite -Identity $SiteCollURL -Owner $SiteOwner -NoWait

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