Any dev resources out there that know how to do real-time user provision on the Cornerstone for Salesforce (CfS) LMS package?

I'm trying to put in place a basic trigger for the auto 'assignment of cases' via communities to ensure that they use the default rule & so that I can remove this checkbox "Assign using active assignment rules" from the page layout.

Here's the trigger code, but it doesn't seem to be working. Any ideas?

**********************************************************************
trigger CommunityCaseAssignment on Case (before insert) {
for (Case c: Trigger.new) {
        if (c.Origin == 'Community') {
           Database.DMLOptions dmlOpts = new Database.DMLOptions();
           dmlOpts.assignmentRuleHeader.useDefaultRule = true;
           c.setOptions(dmlOpts);
        }
        }
}

***********************************************************************
Or are there any other creative solutions around this?

Any dev resources out there that know how to do real-time user provision on the Cornerstone for Salesforce (CfS) LMS package?

I'm trying to put in place a basic trigger for the auto 'assignment of cases' via communities to ensure that they use the default rule & so that I can remove this checkbox "Assign using active assignment rules" from the page layout.

Here's the trigger code, but it doesn't seem to be working. Any ideas?

**********************************************************************
trigger CommunityCaseAssignment on Case (before insert) {
for (Case c: Trigger.new) {
        if (c.Origin == 'Community') {
           Database.DMLOptions dmlOpts = new Database.DMLOptions();
           dmlOpts.assignmentRuleHeader.useDefaultRule = true;
           c.setOptions(dmlOpts);
        }
        }
}

***********************************************************************
Or are there any other creative solutions around this?