PowerShell Get Users Email Address To Exchange - powershell

Question

Trying to do an auto ligation hold script using an ad synced group up to Azure. Would anyone be able to help with the below?
I'm trying to get all my users from the MsolGroup by doing a return of the MsolGroupMembers, I would like to return the users then from that I need to get their UPN/Email Address so I can pipe it into an exchange online command to turn litigation hold on for each of them users from the group.
Import-Module MSOnline
$user="removed"
$file = "removed"
$password = Get-Content $File | ConvertTo-SecureString
$cred = New-Object System.Management.Automation.PsCredential($user,$password)
Connect-MsolService -Credential $cred
$UserCredential = Get-Credential -Credential $cred
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection
Import-PSSession $Session
$usersOfGroup = Get-MsolGroupMember -GroupObjectId removedID -All
foreach ($user in $usersOfGroup)
{
$mailbox = Get-Mailbox $user.EmailAddress
Write-Output $mailbox
if ($mailbox.LitigationHoldEnabled -eq $false -and $mailbox.RecipientTypeDetails -eq "UserMailbox")
{
Write-Output "Current mailbox: " $mailbox.UserPrincipalName
Set-Mailbox -Identity $mailbox.UserPrincipalName -LitigationHoldEnabled $true -LitigationHoldDuration 2555 -WarningAction SilentlyContinue
}
}
Remove-PSSession $Session

Answer 1

This should do the trick.
#Useful Microsoft documentation
#https://technet.microsoft.com/en-us/library/dn767952(v=exchg.160).aspx
#Connect to Exchange Online
Import-Module MSOnline
$O365Cred = Get-Credential
$O365Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri "https://ps.outlook.com/powershell" -Credential $O365Cred -Authentication Basic -AllowRedirection
Import-PSSession $O365Session -AllowClobber
Connect-MsolService -Credential $O365Cred
#Filter mailboxes for the HR Department, pipe to the set litigation command for 365 days
Get-Recipient -RecipientTypeDetails UserMailbox -ResultSize unlimited -Filter 'Department -eq "HR"' | Set-Mailbox -LitigationHoldEnabled $true -LitigationHoldDuration 365
Remove-PSSession -Id $O365Session.Id