Recruiting - Make First Name mandatory

Summary

Recruiting - Make First Name mandatory on External Candidate's Job Application Flow

Content

As the Summary reads, we are needed to make First Name mandatory on the External Candidate's Job Application flow.
We tried making this work by defaulting this attribute from "Manage Person Name Styles"; but although this takes into effect on the Hire an employee page, nothing changes on the Job Application Flow.

Is there a way to make this work ? Has anyone run into a similar situation previously ?

Thanks,
Santhosh

Version

19D