Invitations not working

I have set up an organization within Business. To test whether I could add a user, I set up a new gmail account. Then I sent an invitation to this address and logged out of Zoho Business.

Upon logging into the gmail account, I clicked on the link to accept the invitation, instructed the login to use the gmail account. This redirects to choose a zoho user name. After accepting the default, it redirects to Zoho Business.

However, it is not the organization that the invitation is directed from, and it prompts to set up a new organization.

What am I doing wrong here??!! I would prefer to test this prior to buying a domain!!

Cliff