CB AntiSpam blocking the registration due to the ip address they're using already tied to an existing account. Check within CB AntiSpam > Logs for an ip address log. Alternatively if you don't want this functionality you can turn it off within CB AntiSpam.
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"Alternatively if you don't want this functionality you can turn it off within CB AntiSpam."
The functionality is great. I was just thinking on the threshold. I would expect that from one IP address I may have more than one registrant, for that reason, is there a threshold and if not how can I set one?