Hello -- I am having the same issue and going nuts trying to find the fix. I'm sure it is a setting, but I can't find it anywhere! Any help you could provide would be greatly appreciated! Thanks in advance!!!!
Joomla 1.0.15, CB 1.1, AEC 0.24.4.8
www.wnypaa.org
Select Register -> Fill out form -> Select "Free Plan" and then you will see the "Not Authorized" error.
On a side note, this site was working well for a solid 8-10 months. I did an upgrade a few days ago from 1.0.13 -> 1.0.15 and then started experiencing this issue.
Thank you kindly!