I'm using https://maps.owm.io/map/temperature/3/33/112.png?appid=fe2a775f427aa5fc92ce0379937b9ee9 for the fetch call and it give me the 401 error. There are not many examples of Api calls so it could be the key or the http address.
This endpoint is only available for users who subscribed to Developer plan and higher. It also requires the API key authentication. The access is given only by the request.
Also, there is no tiles with number 33 and 112 on 3rd zoom. Please read about Mercator projection that used here: https://en.wikipedia.org/wiki/Mercator_projection
Layer “temperature” also doesn’t exist. List of available layers and other info you can find here: https://openweathermap.org/api/weathermaps
Here is right example of calll: https://tile.openweathermap.org/map/temp_new/3/2/2.png?appid=fe2a775f427aa5fc92ce0379937b9ee9