Description:

When a user tries to sign up with an email that is already registered within the workspace, there is no on-screen error message indicating the issue. However, the following error appears in the console:
{success: false, error: 'Something went wrong. Please check your credentials. [403]', errorType: 403}

Steps to reproduce:

1.Go to the Rocket.Chat sign-up page.
2.Enter an email that is already linked to an existing user account.
3.Fill out the remaining registration fields and submit the form.

Expected behavior:

It would be helpful if an on-screen error message appeared, informing the user that the email is already in use. Since Rocket.Chat uses @rocket.chat/fuselage-toast for notifications, perhaps this could be used to show the error in a more user-friendly way.

Actual behavior:

Currently, no visible error is shown on the screen. The error is only logged in the console, which may not be obvious to users.

Server Setup Information:

• Version of Rocket.Chat Server: 7.4.0-develop

Client Setup Information

• Operating System:Windows 11 with WSL2.

Additional context

Maybe the sign-up process could catch this specific error and display an on-screen toast notification using @rocket.chat/fuselage-toast. This way, users would immediately know why their registration attempt isn't working, improving the overall user experience.