Set-UnifiedGroup -Identity GroupMailboxIdentity@domain.fi -EmailAddresses @{Add='alias@domain.fi'} Happy Powershelling,
PS
HarriJaakkonen
:~/Blog/Posts>
cat ./office-365-group-and-alias-email-address.html
Office 365 Group and alias email-address.
If You want to archive this You have to use Powershell. Connect to Exchange Online Powershell and use the command below: