PER_ROLES_DN_VL table showing Duty Roles N or Null values

Hi Team, Greetings!
We have encountered an issue while querying the PER_ROLES_DN_VL table for values in the DUTY_ROLE field. The table is only showing 'N' or NULL values, despite the presence of duty roles in the system.
We have executed the following processes:
Retrieve Latest LDAP Changes
Import User and Role Application Security Data
Additionally, we have run the 'User and Role Access Audit Report,' but we have not found any clues to resolve the issue.
Your assistance in this matter would be greatly appreciated.

Thanks&Regards,

Bhuvaneswari K