add email aliases to office365 group

add-email-aliases-to-office365-group.md

Connect to Exchange online

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

Inquire

get-unifiedgroup <groupname> | format-list

Replace email addresses

$a=get-unifiedgroup <groupname>
$b=$a.EmailAddresses
$b += "SMTP:<new-email-address>" 
Set-UnifiedGroup -Identity <groupname> -EmailAddresses $b
Set-UnifiedGroup -Identity <groupname> -PrimarySmtpAddress <correct-email-address>

Better alternative

Set-UnifiedGroup -Identity <groupname> -EmailAddresses @{Add="SMTP:<new-email-address>"}

Disconnect from EOL

Remove-PSSession $Session