vendor not being able to register despite unique credentials

Describe the bug
as soon as you register the vendor an alert is prompted that already a vendor is registered with this email.

To Reproduce
Steps to reproduce the behavior:

Go to vendors
Click on add new
enter details
See error
Expected behavior
if there is an account on that mail it should be shown in the grid view

Screenshots
image

Desktop (please complete the following information):

OS: Windows
Browser Chrome
Version 122.0.6261.95 (Official Build) (64-bit)

No file or test is named. Start by reproducing vendor registration from the Vendors screen in Chrome, then trace the registration and vendor-grid entry points to find where duplicate-email validation and existing-vendor display are handled. Done means unique credentials register successfully and an existing email is represented in the grid rather than producing the reported alert.

Written by the indexing model from the issue text.