PowerShell (local)¶

Import-Module ExchangeOnlineManagement
Connect-ExchangeOnline -UserPrincipalName marcboes@desktopservices.onmicrosoft.com

$groupName="PL-DTS-ReusableComponents"
Get-UnifiedGroup -Identity $groupName | FL HiddenFromExchangeClientsEnabled
# If the value is `True`, unhide the group using:
Set-UnifiedGroup -Identity $groupName -HiddenFromExchangeClientsEnabled:$false

See learn.microsoft.com