Hide Office 365 Groups from the GAL

Schools may require that newly created classes are hidden from the Global Address List (GAL) in Exchange Online. Classes may be hidden through PowerShell. Use the instructions below to hide Classes created with SDS from the GAL.

Classes are represented in Office 365 as Office 365 Groups. In Exchange Online, where the GAL is built, they are called Unified Groups. Use the Get/Set-UnifiedGroup cmdlet to manage these groups through PowerShell.

 

Hide a single class

Launch PowerShell as an Administrator and connect to Exchange Onlineas shown below.

$UserCredential = Get-Credential
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection
Import-PSSession $Session -DisableNameChecking

Once connected, run the command below against the Group you want to hide.

Set-UnifiedGroup -Identity <UnifiedGroupIdParameter> -HiddenFromAddressListsEnabled $true 

 

Hide all classes created by SDS

Launch PowerShell as an Administrator and connect to Exchange Online as shown below.

$UserCredential = Get-Credential
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection
Import-PSSession $Session -DisableNameChecking

Once connected, run the command below against all SDS-created groups.

 $Groups = Get-UnifiedGroup -ResultSize Unlimited | ? {$_.PrimarySmtpAddress -like "Section_*"}
Foreach ($Group in $Groups) {Set-UnifiedGroup -Identity $Group.Name -HiddenFromAddressListsEnabled $true}
}

 

 

https://docs.microsoft.com/en-us/schooldatasync/hide-office-365-groups-from-the-gal

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