@TomSlavkovsky you were right, the problem was that I was trying to use the same API key that I am using for the api4 chart.
Anyone else that stumbles upon this issue and is having trouble figuring out which key to use, read the following:
The API key that you receive from this URL, https://api4.windy.com/api-key/, will not work. You need instead to go to https://stations.windy.com/stations and click on "show key" in the banner on the bottom of the page. That is the key you need to access the JSON data from the stations.