user picker field does not work with user name

[Ti-Fen Pan]

We are trying to figure out how to submit forms with jira server because user picker field does not accept user_name for jira server request type submission.   The below is one of the  example.  Any pointers here?

curl --location --request POST 'https://jira.test.vxxx.com/rest/servicedeskapi/request' \

--header 'Accept: application/json' \

--header 'Content-Type: application/json' \

--header 'Authorization: Basic c3ZjX212d29ya3NfamlyYTppOSo0N25DcSpLTjJLMmhVdEtmVg==' \

--data-raw '{

"requestTypeId": "88",

"serviceDeskId": "4",

"raiseOnBehalfOf": "xxx@moveworks.ai",

"requestFieldValues": {

"summary": "Moveworks/Vaya Test (please ignore)",

"customfield_10052": {"name": "user_name"} // a user picker field

}

}'

The response we got 
```

bond server reply: rest_pool: {\"errorMessage\":\"Your request could not be created. Please check the fields have been correctly filled in. We can't create this issue for you right now, it could be due to unsupported content you've entered into one or more of the issue fields. If this situation persists, contact your administrator as they'll be able to access more specific information in the log file.\",\"i18nErrorMessage\":{\"i18nKey\":\"sd.validation.request.creation.failure.required.field\",\"parameters\":[\"We can't create this issue for you right now, it could be due to unsupported content you've entered into one or more of the issue fields. If this situation persists, contact your administrator as they'll be able to access more specific information in the log file.\`

[Brant Schroeder]

@Ti-Fen Pan If you remove the custom field are you able to submit the issue?