Null wrapUpCode in /api/v2/analytics/interactions/summary

Querying the interactions summary endpoint returns null for wrapUpCode on every single row. We’ve verified the agents are actually selecting codes in the UI. The query JSON looks standard enough:

{
“dateFrom”: “2023-10-01T00:00:00.000Z”,
“groupBy”: [“wrapUpCode”]
}

Is this field just broken in the API or am I missing a specific groupBy parameter?