Licence assignments, Conditional Access policies, and user-targeted app deployments all key off group membership, and the portal adds members one at a time. When someone hands you a list of forty people who need a licence, that is forty rounds of search, click, confirm.
This script takes the list instead. Enter a prefix to narrow the group picker, choose the target group, then pick the file of UPNs. Each one is resolved in Entra ID and added to the group, with anyone already a member skipped rather than re-added, and any UPN that does not resolve reported so you can follow it up. It confirms before making changes and prints the group’s full membership at the end.
Uses the Microsoft Graph PowerShell SDK and asks only for GroupMember.ReadWrite.All and User.Read.All. The device equivalent is Add Devices to a Group.
