Mapbox MTS visualization not displaying on Looker.

[Data_Gwiz]

Hey there,

So I am facing errors in displaying my custom clusters after successfully uploading them on mapbox via MTS due to the size of the geojson. I referenced this article large-custom-map-layers-with-tiles-13454 but nothing displays on Looker 

map_layer: tract {

  format: "vector_tile_region"

  url: "https://a.tiles.mapbox.com/v4/[YOUR_MAPBOX_TILESET_ID]/{z}/{x}/{y}.mvt?access_token=[YOUR_MAPBOX_ACCESS_TOKEN]"

  feature_key: "[YOUR_MAPBOX_TILESET_NAME]"

  extents_json_url: "https://rawcdn.githack.com/[YOUR_EXTENTS.JSON_FILE_LOCATION]"

  min_zoom_level: [FROM_MAPBOX]

  max_zoom_level: [FROM_MAPBOX]

  property_key: "[THE_UNIQUE_IDENTIFIER_FOR_REGIONS_IN_YOUR_SHAPEFILE]"

}

Everything is specified, mapbox tileset id, access token used to upload via MTS, extents_json_url, min, max and property key.

Any ideas on where the issue might be from and how it can be resolved?