If users have JavaScript turned off then SmartONEACCOUNT is not called and your requirements in one account are not applied.

This can be solved through blocking use of the registration form if JavaScript is disabled which can be done using some simple JS and CSS - contact us for details.

Otherwise, for the few registrations that come in through this manner you can handle them manually. Given JavaScript is used by 97%+ of users according to the latest stats this will be very few registrants.