Candidate Name from Alert Composer

Hello,

As our client want to show the Full Name of the Candidate in the Alert Composer notification like below, however, I found that ${CandidateLastName} and ${CandidateFirstName} is returning NULL; while ${CandidateFullName} and {CandidateDisplayName} both showing the the "First Name"

Did I input an incorrect token for CandidateFirstName, or whether the Alert Composer is not support CandidateFirstName and CandidateLastName?