Values.UnsuccessfulFaceAssociationSourceContains metadata like FaceId, UserID, and Reasons, for a face that was unsuccessfully associated.
type nonrec t = {faceId : FaceId.t option;A unique identifier assigned to the face.
*)userId : UserId.t option;A provided ID for the UserID. Unique within the collection.
*)confidence : Percent.t option;Match confidence with the UserID, provides information regarding if a face association was unsuccessful because it didn't meet UserMatchThreshold.
*)reasons : UnsuccessfulFaceAssociationReasons.t option;The reason why the association was unsuccessful.
*)}