Map-card: a slightly improved map-card

What is the right configuration for OpenWeather Weather Maps 2.0?

Here is an example config I’m using (API keys redacted):

type: custom:map-card
focus_entity: zone.home
zoom: 6
card_size: 10
entities:
  - entity: zone.home
    display: icon
    size: 40
tile_layers:
  - url: >-
      https://maps.openweathermap.org/maps/2.0/weather/1h/PR0/{z}/{x}/{y}?appid=<I have replaced this with my actual API key>
    options:
      attribution: <a href="https://openweathermap.org/">OpenWeatherMap</a>
      apikey: <I have replaced this with my actual API key>

It’s not displaying anything and I’ve tried a few different values. Does the attribution key need to be altered in some way?