Role assignment is consistently failing in AI Agent?

Summary:

Hi Oracle Community,

I am working on a requirement to:

1. Fetch employee roles using PersonNumber
2. Compare roles against a target list
3. Assign missing roles to the employee
4. Revoke roles that should not exist

Revoke is working perfectly. However, role assignment is consistently failing.

ENVIRONMENT
• Oracle Fusion HCM Version: 24B
• Instance: Demo / Dev
• Tool: Postman / REST API

WHAT I HAVE TRIED

• POST /hcmRestApi/resources/11.13.18.05/userAccounts/{GUID}/child/userAccountRoles
  Body:
  {
  "RoleCode": "ORA_HRC_HUMAN_CAPITAL_MANAGEMENT_APPLICATION_ADMINISTRATOR_JOB",
  "RoleType": "ORA_HRC_ROLE_TYPE_JOB"
  }
  Error: PER-1532349 — The role request couldn't be created because the role isn't requestable.

• POST /hcmRestApi/resources/11.13.18.05/roleRequests