CXone Data Action returns undefined in success output — JSON path mapping issue

Architect & Flows
1

We’ve got a Data Action in CXone Studio that calls our internal Node.js webhook. The webhook responds with a 200 OK and the JSON body looks perfect.

Here’s the response payload:

{
 "statusCode": 200,
 "body": {
 "agentId": "12345",
 "status": "available"
 }
}```

In the Data Action configuration, I'm mapping the success output to `$.body.agentId`. But when I debug the flow, the variable comes back as `undefined`. 

I've tried:
- `$.agentId`
- `$.body["agentId"]`
- `$.data.agentId`

Nothing works. The error log just says `Output mapping failed: undefined`. Is the CXone parser stripping the outer `body` wrapper? Or is there a specific JSONPath syntax I'm missing for nested objects in webhook responses?

GET /api/v2/dataactions


The action ID is `da-12345`. Any ideas?