Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi Michel,
You can use following PowerShell cmdlet to hide an Office 365 Group from GAL:
Set-UnifiedGroup -Identity *** Email address is removed for privacy *** -HiddenFromAddressListsEnabled $true
For more information about the cmdlet Set-UnifiedGroup, please refer to:
https://technet.microsoft.com/en-us/library/mt238274(v=exchg.160).aspx
Thanks,
Franky