Hi
the article here describes how to add the domain to Active Directory:
This would be used for UPN's that are being synchronized to Azure/Microsoft365 using AzureAD Connect.
However, I would strongly advise against exposing your Active Directory or any part of your internal infrastructure to the Public Internet. Ensure you use Firewalls and place public facing resources in a DMZ with tightly locked down rules where absolutely necessary.
Thanks
Michael Durkan
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