Hi @rob.kraft,
Welcome to the Auth0 Community and sorry for the late reply !
Within the Custom Database Login script you can identify Generally the application that is making the request can be identified using it’s unique clientID, but this object is currently still inaccessible within the Custom Database Login script, so i would encourage you to upvote this Feedback request.
However, you can work around this by accessing the event.client_id using a Post-Login Action.