Custom Object Approval Process Omni-Channel Routing Configuration

I have a Custom Object + Approval Process assigned to a Queue- that I would like to be assigned as a Work-Item via Omni-Channel router. I have configured the necessary configurations (I think), however, when I log in as one of my Queue members and set their Presence Status to an "Available" state, they do not receive a new "Work Item".

Maybe I'm just misunderstanding Approval Process relationships to Work Items in Omni-Channel Routing on a Queue: I assume that if an agent is a member of a Queue, and that Queue is assigned as an Approver in an Approval Process, then when a new record is assigned to that queue, the member is notified that that approval is a work item for them by Omni-Channel Router?

Here is my setup to see where I am missing something:

New Custom Object = Credit_Request__c, with a custom field Type__c with picklist value Wireless and Non-Wireless.

I have created a Queue for these Custom Objects:

I have an Approval Process for Credit_Request__c:

I have added a trigger to submit the record for Approval as soon as it's inserted:

trigger CreditRequestTrigger on Credit_Request__c (after insert) {

 List<Approval.ProcessSubmitRequest> requestList = new List<Approval.ProcessSubmitRequest>();
    List<Approval.ProcessResult> resultList = new List<Approval.ProcessResult>();
    try{
        for(Credit_Request__c creditRequest: Trigger.new){
                            Approval.ProcessSubmitRequest req = new Approval.ProcessSubmitRequest();
                req.setComments('Submitting request for approval.');
                req.setObjectId(creditRequest.id);
                requestList.add(req);
        }
        resultList = Approval.process(requestList);
    }catch(Exception e){
        System.debug('error when submitting for approval: ' + e);
        for(Approval.ProcessResult result : resultList){
            if(result.getErrors().size() > 0){
               // creditRequestMap.get(result.getEntityId()).addError('There was a problem submitting for approval');
            }
        }
    }
}

Additionally, I have created a Service Channel associated with the Custom Object:

Routing Configuration:

And Presence Status- which I have made available to the profile of my Queue Member:

And those presence statuses are associated with the appropriate channel:

I then create a record with my user (Manually inserting from Dev. Console), and I don't see any errors with the Approval Process trigger running.

However when I log in as a Queue Member and set my presence status as "Available" I do NOT see any work items?