Querying and filtering callbacks via the /conversations/details/query API

[upapan.v]

Hi there,

I have created a callback via POST/api/v2/conversations/callbacks with this body

{  
  "queueId": "GUID",  
  "callbackScheduledTime": "2024-07-18T04:52:19.001Z",  
  "countryCode": "+61",  
  "validateCallbackNumbers": false,  
  "callbackNumbers": [  
    "+6112345567"  
  ],  
  "callbackUserName": "[12345] Firstname Surname",  
  "data": {  
    "email": "test-email@test.com",  
    "serialNumber": "12345",  
    "issueDescription": "I have an issue"  
  }  
}

Then, I'd like to be able to query callbacks specifically created with this callbackUserName. I am trying to use the POST /api/v2/analytics/conversations/details/query API with this body

{
  "order": "desc",
  "orderBy": "conversationStart",
  "interval": "2024-07-01T14:00:00.000Z/2024-07-30T14:00:00.000Z",
  "segmentFilters": [
    {
      "type": "and",
      "predicates": [
        {
          "dimension": "mediaType",
          "value": "callback"
        },
        {
          "dimension": "segmentType",
          "value": "Scheduled"
        },
        {
          "dimension": "segmentEnd",
          "operator": "notExists"
        },
        {
          "dimension": "queueId",
          "value": "GUID"
        },
        {
          "dimension": "participantName",
          "value": "[12345] Firstname Surname"
        }
      ]
    }
  ]
}

The issue appears to be the final predicate on participantName. Without it, I can get the desired conversation back, but I can't find any way to filter based on the participantName, even though I can see it in the response itself.
How can I filter based on the participantName or something related to the callbackUserName in the original callback creation?
Many thanks