Should I (the operator) be reporting all accounts involved in participant breaches or only those that fall under the remit of the MGA?

In cases involving a participant breach but not necessarily entailing a suspicious event, only suspicious betting accounts falling within the remit of the MGA licence ought to be reported. However, if an event would be deemed suspicious due to activity emanating from such account holders, then the MGA would still require that it is notified of such an event (if the said event was offered to bettors falling within the remit of the MGA licence also).