Set the target user ID in the format to which the user risk provider expects to identify end users. It most cases, it is the same value as the default User Authenticated ID. In other cases, the user risk provider might use a different user ID; for example, the end user logs in with a sAMAccount name, but the user risk provider uses an email address as the user identifier.
To use another user identifier, you must map that field to a property in the Data tab. Then, from the Risk Score User Identifier list, select the mapped Property.
For example, on the Data tab, in the Profile fields section, Email 1 field is mapped as a Default Provider source with a field entry of mail. So, for the Risk Score User Identifier field, you would select Email 1.