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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