One ZohoMail Account for TWO Domains?

One ZohoMail Account for TWO Domains?

Hi,

I have a domain and have a Zoho account to manage email affiliated with that domain.  No problems there.

I just purchased a second domain site using the same registrar, and I can't figure out how to use ZohoMail for the 2nd account as well.  When I try to register it, it says, "Your organization is already registered with Zoho Mail".

Any ideas how I can manage two domain email addresses with one ZohoMail account?  Thanks.