Create-MailEnabledSecurityGroups.ps1

param(
    # Credentials paramter should be a variable containing the result of Get-Credential
    [Parameter(Mandatory = $true)]
    [pscredential]$Credentials,

    [Parameter(Mandatory = $true)]
    [string]$ConfigFile
)

$ErrorActionPreference = "Stop"

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $Credentials -Authentication Basic -AllowRedirection
Import-PSSession $Session -DisableNameChecking | Out-Null

try {
    # Confirm connection to Exchange Online and cmdlets are available
    $testCommand = Get-Command "Get-DistributionGroup" -EA "Stop"
    
    Write-Host "`nCreating mail-enabled Azure AD security groups"

    Write-Host "`nImporting $ConfigFile...`n"
    
    Import-Csv -Path $ConfigFile | ForEach-Object {
        try {
            $group = Get-DistributionGroup -Identity $_.GroupName
            Write-Host "Group '$($_.GroupName)' exists, skipping..." -ForegroundColor Yellow
        }
        catch {
            Write-Host "Creating Mail-enabled security group '$($_.GroupName)'..."
            
            New-DistributionGroup -Name $_.GroupName -Alias $_.MailNickName -Type "Security"
        }
    }
}
catch {
    Write-Error "Unable to connect to Exchange Online"
}

Remove-PSSession $Session

MailEnabledGroups.csv