Enatega Admin-dashboard: Unable to add a new Staff to the admin dashboard

Describe the bug
When attempting to add a new Staff through the admin dashboard, the system fails to register the staff. The new staff does not appear in the staff list, and no confirmation message is shown.

Steps to Reproduce:

Open the Admin Dashboard.
Navigate to the Staff Management section.
Click on the Add New Staff button.
Fill in the required staff details.
Click Save or Submit.
Observe that the new staff is not added to the list.

Desktop (please complete the following information):

OS: [e.g. Windows]
Browser [e.g. chrome, ]
Version [e.g. Latest]

Reproduce the failure from the Admin Dashboard by opening Staff Management, selecting Add New Staff, and submitting the required details. Trace the staff-creation flow from the dashboard through its request handling; done means the new staff appears in the staff list and a confirmation message is shown.

Written by the indexing model from the issue text.