Problem Description

When attempting to add an email address that already exists in the system, the UI returns a vague, generic error message.

In the previous UI, the error explicitly stated the email address was already in use.

Current behavior

• A generic, non-descriptive error is shown when trying to add an email address that already exists.

• Error does not clarify whether the email is already associated to an existing account.

Expected behavior

• If the email address already exists in the system, show a clear error such as "Email address already in use".