Checks should be made on players who registered for new igaming accounts between 2 and 20 October, after the KSA said it received reports that consumers signed up to Cruks were able to access online gambling during this period.
Once signed up to Cruks, players should not be able to register for new igaming accounts with licensed operators or access any form on online gambling from these brands.
The KSA said that the error may have been down to inaccuracies when signing up to Cruks, such as a consumer inputting their citizen service number (BSN), name or date of birth incorrectly.
Should this be the case, the KSA said Cruks should be consulted by operators to ensure the correct information is inputted and registered players are blocked from accessing their igaming account.
The KSA added that the issue has since been rectified, with Cruks having updated its system whereby if a BSN, name or date birth is inputted incorrectly, this is then flagged up to the consumer via automatic verification from within the Citizen Service Number Management Facility.
An error with Cruks had previously caused the launch of the Dutch online gaming market to be delayed by a day, while the Cruks system was not available to customers until 4 October, three days after the igaming market launched.
Minister for Legal Protection Sander Dekker later revealed that the problem was due to the fact that Cruks had not been tested using real BSN numbers.
Last month, the KSA appointed three external advisors to help oversee Cruks.
Bas Brons, Mieke Hoste and Marcel Marijnissen will now advise on the system, which allows consumers to self-exclude from gambling and for licensed operators to request involuntarily exclusion of a player direct with the KSA.
All licensed operators in the country are required to integrate with Cruks in order to see if any of their players are registered with the scheme.