E-mail Id(s) To Notify isn't auto poplulating for reqesters

E-mail Id(s) To Notify isn't auto poplulating for reqesters

As a technician, the " E-mail Id(s) To Notify" field on our incident and service request templates will automatically start populating with names of users that we have  connected  to our Active Directory. There is also the little button to "Search Requester List" that is available. 

However for requesters, neither of the two are available or happen and email addresses have to be manually entered. How can we fix this? The field is set to allow editing by the requester.

Thanks,
Tammy
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