Client, White & Case, have a job that will add a phone to an existing user and line.
Currently if you want to send an email that includes an inserted AD attribute, example telephoneNumber, it will only replace the attribute if you are doing DN to AD sync to update that attribute.
Client will like the ability to pull the existing value of that attribute to replace it in the Email without having to update via DN to AD sync.
Reference Zendesk ticket #42598