The employee's advisor role may have been removed. You can restore their advisor role using the following steps:
  1. Navigate to Core > People Finder
  2. Search for the employee
  3. Click 'Employment' just under 'Personas'
  4. Click the Edit button
  5. Mark the checkbox next to Advisor in the Employee Roles section
  6. Click the 'Effective Immediately' radio button
  7. Click Save & Exit.