(ArcGIS API for Python) Update service definition in AGOL

sample.py

import arcgis
from arcgis.gis import GIS
from arcgis.features import FeatureLayerCollection

# Log into AGOL account [admin level]
gis = GIS(None,'username', 'password', verify_cert=False)

# Grab the feature layer item by id
featureLayerItem = gis.content.get('feature layer id')

# Get the FeatureLayer Collection from the featureLayer
flProps = FeatureLayerCollection.fromitem(featureLayerItem)

# Dcitionary of the stuff I want to change
flProps_dict = {
    'layers': [
        {
            "id": 0,
            "name": "U.S. States (Generalized)",
            "parentLayerId": -1,
            "defaultVisibility": False,
            "subLayerIds": 'null',
            "minScale": 0,
            "maxScale": 0,
            "geometryType": "esriGeometryPolygon"
        }
    ]
}

#Update the definition of the service and print out if it was successful 
print(flProps.manager.update_definition(flProps_dict))
print(flProps.properties.layers[0])