problem to Add Request via - /api/v3/requests

problem to Add Request via - /api/v3/requests

I have problem to Add Request via /api/v3/requests all time getting response 
{
    "response_status": {
        "status_code": 4000,
        "messages": [
            {
                "status_code": 4001,
                "field": "requester",
                "type": "failed"
            }
        ],
        "status": "failed"
    }
}

p.s
i can update req. with problem via /api/v3/requests
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