OpenWeatherMap always shows 'Invalid API key'
Just installed Homebridge on a new Raspberry Pi 4 B. Everything is up2date.
I installed and configured homebridge-weather-plus as described in the doc. But I cannot get a connection to OpenWeatherMap (Free). I tried a lot different configurations but none worked for me. Here is my example now (very dumped down, disabled all there is to disable, hidden everything there is to hide).
```
{
            "units": "si",
            "interval": 60,
            "stations": [
                {
                    "nameNow": "Dahoam",
                    "service": "openweathermap",
                    "key": "MyApiKey", // also tried adding a new one, didn't work
                    "locationCity": "Munich", // also tried "Munich, DE", also tried long/lat
                    "language": "de",
                    "compatibility": "home", // also tried Apple Home /w Eve
                    "conditionCategory": "simple",
                    "now": false,
                    "extraHumidity": false,
                    "hidden": [
                        "Air Pressure",
                        "Cloud Cover",
                        "Condition",
                        "Condition Category",
                        "Dew Point",
                        "Forecast Day",
                        "Humidity",
                        "Observation Station",
                        "Observation Time",
                        "Ozone",
                        "Rain",
                        "Rain 1h",
                        "Rain Day",
                        "Rain Chance",
                        "Snow",
                        "Solar Radiation",
                        "Sunrise Time",
                        "Sunset Time",
                        "Temperature Min",
                        "Temperature Apparent",
                        "UV Index",
                        "Visibility",
                        "Wind Direction",
                        "Wind Speed",
                        "Wind Speed Max"
                    ]
                }
            ],
            "platform": "WeatherPlus"
        }
```

Also used the example config: https://github.com/naofireblade/homebridge-weather-plus#example (with OWM)

Did I miss something?