When you want to log in to Zoho CRM via Google Apps you may not get the option to enter your Username and Password. Instead, you may get this error message from Google:

"Currently this single sign-in feature is disabled for the domain (domainname.com)."

You get this error message when the option, Allow users to sign in to third party websites using OpenID, is not enabled.

To enable the option and log in to Zoho CRM via Google Apps:

1. Log in to Google Apps and go to Google Mail.
2. Click Settings (icon) > Manage > Advanced Tools.
3. In the Advanced Tools page, under Authentication section, click Federated Login using OpenID.
4. Select the check box for Allow users to sign in to third party websites using OpenID.
5. Click Save Changes.
   Now, try logging in to Zoho CRM via Google Apps.