Limiting requester to someone in SDP

Limiting requester to someone in SDP

When one of our users is using the self-service portal, they are able to enter any name into the requester field. Is it possible to limit that name to someone already in SDP?

This issue is that they may be using the incorrect convention (we use lastname, firstname), and people may enter firstname lastname and it then creates a second SDP account.

Thank you,
ADam

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