Error Message When Inviting Someone To Zoho Mail In Our Organization

We have been using gmail in conjunction with zoho but are now wanting to switch to use zoho as our email client instead. We are using the same domain name @thehireconnection.net and have already verified ownership. As we began adding new users, most were added with minimal problems but two came back with the same error message (different email addresses of course) and I am not sure what it means, nor are the individual users. Did anyone else encounter this and how did you rectify the situation? I will link the error message and email addresses below....

Tommy@thehireconnection.net

Welcome to Zoho Business.

You have been invited by Rob Weigand ( rob@thehireconnection.net) to join the organization " thehireconnection" in Zoho Business.

Note : Your email address( tommy@thehireconnection.net) is already registered as administrator under the Organization zoho_tommy37. To join the organization thehireconnection, you should dissociate from the earlier organization and role.

Click on the link given to join the group. Alternately, if you do not want to join the group, you can click the reject link.