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]

Start by reproducing the failure through the Admin Dashboard's Staff Management section using the Add New Staff flow, then inspect the browser request and server response when Save or Submit is clicked. Confirm the cause and update the flow so a valid staff member is registered, appears in the staff list, and shows a confirmation message.

Written by the indexing model from the issue text.