Function to recursively list group members (nested)

Get-MembersRecursive.ps1

## Function to recursively list group members (nested)
Function Get-MembersRecursive {
    param (
        [parameter()]
        [string]$RecipientName
    )
    $groupMembers = @()
    $group = Get-Group $RecipientName -ErrorAction SilentlyContinue
    foreach ($groupMember in $group.Members) {
        $memberObj = Get-Recipient $groupMember -ErrorAction SilentlyContinue

        if ($memberObj) {
            if ($memberObj.count -gt 1) {
                $memberObj = Get-Recipient -Filter ('Name -eq ' + "'$($groupMember)'")
            }
            if ($memberObj.RecipientTypeDetails -match 'group') {
                $groupMembers += (Get-MembersRecursive $groupMember)
            }
            else {
                $groupMembers += $memberObj
            }
        }
    }
    $groupMembers = $groupMembers | Sort-Object -Property Name -Unique
    return $groupMembers
}