I cannot be a member of two ore more businesses

I cannot be a member of two ore more businesses

Hello,

I'm playing around with the Business module.
I already have a single Zoho account (name, not email address).

For the Business module, my account name is my email address.
I defined two businesses, using two different email addresses: my personal zoho email account for my 'personal' business, and another email account as admin of a second busniess.

In the second business (where I use the second email account as an admin account) I want to add myself (with my first email account) as a normal user.
When I use my personal email address, Zoho tells me that that user has already a business, and refuses to add me in this second business.

What to do? I don't like creating more email accounts just for the sake of being a member of more than one businesses.

Thanks,
Ren�