Hello,
First of all, you need to make sure that the Activity Scope of the business rule is configured so that it triggers for the users created by the script. For example, if the users are created in the Users OU, the rule should look like the following:
Also, you need to make sure that the -AdaxesService parameter is specified for the cmdlet in the script. In other case, the operation is performed directly in Active Directory bypassing Adaxes.