My registration problem was because I was using a paid for Home Essentials version which was not expected to be upgraded to the beta. I could not resolve this directly on my server and had to contact ClearOS for them to resolve at their end. I am not sure exactly what was done to resolve it but I think you will also have to contact them directly. In my case this issue was resolved very quickly and easily. Make sure you have rebooted the server after the upgrade also.
My initial point of contact was through the firstname.lastname@example.org who forwarded my system details to the correct person to resolve.