Entra ID - Create New Group with Members of Existing

DuplicateGroup.ps1

# Connect to Microsoft Graph
Connect-MgGraph -Scopes "Group.ReadWrite.All"

# Add in Entra Group ID of the Existing Group below
$sourceGroupId = "<ExistingGroupObjectId>"

# Fetch ALL members
$members = Get-MgGroupMember -GroupId $sourceGroupId -All

# Create the new Group
$newGroup = New-MgGroup -DisplayName "New Group Name" -MailEnabled:$false -MailNickname "newgroup" -SecurityEnabled:$true

# Add members to the new group
foreach ($member in $members) {
    New-MgGroupMember -GroupId $newGroup.Id -DirectoryObjectId $member.Id
}