How i get this powershell dynamic script working? - powershell

Question

Hello everyone i need this script to work and i'm stuck with a error.
I need to have a dynamic script with user choice and linking the mailbox we enter in first step to the HR choice.
In the csv part we have a group distribution list
Error says that i can not do the add-distributiongroupmember and i don't know why
can someone help me on this one ?
(I just do the 0 part choice because i need this one to work before doing the other choice)
code below
Connect-ExchangeOnline
$User = Read-Host "Enter Name of the mailbox to add"
Try {
$Mbx = Get-Mailbox -Identity $User -ErrorAction Stop | Select -ExpandProperty PrimarySmtpAddress}
Catch {
Write-Host "No mailbox can be found called" $User; break }
$Services = [System.Management.Automation.Host.ChoiceDescription]::new('&Services')
$Services.HelpMessage = 'Get running services'
$HR = New-Object System.Management.Automation.Host.ChoiceDescription '&HR', 'Get running HRDL'
$Legal = New-Object System.Management.Automation.Host.ChoiceDescription '&Legal', 'Get running LegalDL'
$Quit = New-Object System.Management.Automation.Host.ChoiceDescription '&Quit', 'Quit menu'
$options = [System.Management.Automation.Host.ChoiceDescription[]]($HR, $Legal, $Quit)
$Result = $host.UI.PromptForChoice('Task menu', 'Select a Department', $options , 0 )
$DLs = Import-Csv -Path "C:\Users\GregorySemedo\Desktop\Script\DL\DL-HR.csv"
switch($Result)
{
0 { ForEach ($DL in $DLs) {
Try {
Add-DistributionGroupMember -Identity $DL."HR" -Member $Mbx -ErrorAction Continue }
Catch {
Write-Host "Couldn't add" $Mbx "to DL" (Get-DistributionGroup -Identity $DL."HR").DisplayName }
If($?)
{
Write-Host $User Succesfully added -ForegroundColor Green
}
Else
{
Write-Host $User - Error occurred -ForegroundColor Red
}}
}
}