Unable to Include Signature and Date field outside of Signature Box via API

Hi all,

I'm working with Adobe Sign via an API call which sends a document out for signature.

I'm using the POST method (/agreements) detailed here: https://secure.na4.adobesign.com/public/docs/restapi/v6#!/agreements/createAgreement

I'd like to include two fields for the signer: a signature field and a date field. So I'm using the 'formFieldGenerators' parameter, which is supposed to place fields on the agreement prior to sending out for signature. In my document, I have a signature section which I'm trying to use as the anchor text for the signature field.

However; every time I use the parameter 'formFieldGenerators' Adobe Sign seems to ignore it, automatically placing a Signature Box at the bottom of the agreement and not including the fields detailed in the 'formFieldGenerators' parameter. This signature box includes a signature field and an email field.

I'm copying my JSON body for a request (removing emails and transient doc ID) in which I tried to place the signature field: 

Body
{"mergeFieldInfo":[],"participantSetsInfo":[{"role":"SIGNER","name":"SIGNER","memberInfos":[{"email":"test@email.com"}],"order":1}],"hasFormFieldData":true,"senderEmail":"test@email.com","name":"Test","emailOption":{"sendOptions":{"initEmails":"ALL","completionEmails":"NONE"}},"signatureType":"ESIGN","formFieldGenerators":[{"formFieldNamePrefix":"TEST","participantSetName":"SIGNER","formFieldDescription":{"displayLabel":"Signature","visible":true,"conditionalAction":{"anyOrAll":"ANY","action":"SHOW"},"origin":"GENERATED","inputType":"SIGNATURE","readOnly":false,"contentType":"SIGNATURE","required":true},"anchorTextInfo":{"anchorText":"Signature:","anchoredFormFieldLocation":{"offsetX":5,"offsetY":0,"width":75,"height":25}},"generatorType":"ANCHOR_TEXT","linked":true}],"fileInfos":[{"transientDocumentId":"12345","label":"Test"}],"state":"IN_PROCESS"}