Forge not generating master view

Question

I've been trying to use the forge viewer and I cannot get it to translate the .rvt files with the room info. I read you need to specify: "generateMasterViews": True and in the headers 'x-ads-force: true' What am I doing wrong??? here is my code:

model_url='modelderivative/v2/designdata/job'
urn=json.loads(r_file.text)["objectId"]
print(urn)
urn_b=base64.b64encode(bytes(urn,'ascii'))
urn1=urn_b.decode('ascii')

headers4={
            'content-type': 'application/json',
            "Authorization": 'Bearer ' + access_token,
            "x-ads-force": 'true'
        }
format_type = 'svf';
format_views = ['2d','3d'];
data4={
        'input': {
            'urn': urn1
        },
        'output': {
            'formats': [
                {
                    'type': format_type,
                    'views': format_views
                },
            ],
            "advanced": {
                "generateMasterViews": True
            }

        }
    }
r_model=requests.post(base_url+model_url,headers=headers4,data=json.dumps(data4))
r_model.text