Searching for issues requiring approval via REST, response doesn't contain issue

[ShawVMW]

• I created a workflow with a "Waiting for Approval" stage.  
• I assigned this workflow to a Request type
• as a portal user created one of these requests
• I verified that the status was "Waiting for Approval"
• I then assigned the ticket to myself.

At this point I would expect the following query to return the approval item but it does not:

https://api.atlassian.com/ex/jira/<my service desk id>/rest/servicedeskapi/request?requestOwnership=APPROVER&requestStatus=OPEN_REQUESTS&approvalStatus=MY_PENDING_APPROVAL&expand=requestType

Unfortunately, this query does not return any records.  What am I doing wrong here?  Is it true that the "waiting for approval" state is correlated with the "MY_PENDING_APPROVAL" and "APPROVER" request ownership?

Thanks!