---
title: "Can my employees sign in to my Catalyst app with their existing Zoho accounts while Public Signup is turned off?"
url: https://docs.catalyst.zoho.com/en/faq/cloud-scale/employees-sign-in-with-zoho-accounts/
description: "No. In Catalyst CloudScale Authentication, social logins, including Zoho, are available only while Public Signup is enabled, and so is Custom User Validation. …"
last_updated: 2026-11-13T05:00:22Z
service: CloudScale
type: faq
---

No. In Catalyst CloudScale Authentication, social logins, including Zoho, are available only while **Public Signup** is enabled, and so is Custom User Validation. With Public Signup off, you add users yourself from **User Management**, and they sign in with the password they set for your app.

To let only named employees in with their Zoho accounts:
1. Enable **Public Signup** and the Zoho social login in **CloudScale** → **Authentication**.
2. Write a Basic I/O function that reads the sign-up request and returns `status: "failure"` for any email address that isn't on your allow-list.
3. In **Authentication** → **Whitelisting**, turn on **Custom User Validation**, select the function and click **Configure**.
4. To remove someone's access later, disable or delete them in **User Management** → **Users**, because Custom User Validation runs only when a user signs up, not at each sign-in.

Note: Catalyst doesn't offer a sign-in limited to one company's Zoho organization, and a Zoho sign-in creates a new app user rather than linking to a user you invited with the same email address.

Refer to the [Custom User Validation help page](https://docs.catalyst.zoho.com/en/cloud-scale/help/authentication/whitelisting/custom-user-validation/introduction/) for details.