PostSignOption don't work

Hi, i use the api and in the Method Post: https://api.na1.echosign.com:443/api/rest/v6/agreements

{
            "fileInfos": [{
                "transientDocumentId": "<<ID>>"
            }],
            "name": "<<NAME>>",
            "message": "Message of the email",
        
            "participantSetsInfo": [{
                "memberInfos": [{
                    "email": "'<<EMAIL>>",
                    "securityOption": {
                        "authenticationMethod": "NONE"
                      }
                }],
                "role": "SIGNER",
                "order": 1
            }],
            "AgreementInfo":[{
                "externalId": "123",
            "postSignOption": "<<URL>>"
            }],
            "PostSignOption":[{
                "redirectDelay": 1,
                "redirectUrl": "<<URL>>"
            }],
            "signatureType": "ESIGN",
            "state": "AUTHORING"
        }

I'm missing something?