Dropbox error: Getting error 400 and no data submitted and no Body

Hi, I’m trying to create a file request for an Uploads folder lwith a user’s email as the folder name such as Uploads/joe@joe.com

I have Zaps set up as

1. Gravity Forms Submission

2. Create Dropbox Folder -- Uploads/Email with email from Form in #1​​​​​​

3 Create File Request (Custom Action) Dropbox - i just want to create a link for user to submit images houses in the Folder generated in #2. 

When i test #3 i’m getting a 400 error with no data submitted and no body...I can’t figure out the issue:

here’s JSON from test:

{
    "result": {
        "request": {
            "method": "POST",
            "url": "https://api.dropboxapi.com/2/file_requests/create",
            "querystring": null,
            "headers": {
                "Content-Type": "application/json"
            },
            "body": "{\"title\":\"Submit Your Images\",\"destination\":\"Uploads/joe@joe.com\",\"open\":\"{{open}}\",\"deadline\":{\"deadline\":\"{{deadline}}\",\"allow_late_uploads\":\"{{allow_late_uploads}}\"}}",
            "data": {
                "title": "Submit Your Images",
                "destination": "Uploads/joe@joe.com",
                "open": "{{open}}",
                "deadline": {
                    "deadline": "{{deadline}}",
                    "allow_late_uploads": "{{allow_late_uploads}}"
                }
            }
        },
        "response": {
            "status": 400,
            "headers": {},
            "body": "null",
            "data": null
        }
    }
}