You didn’t answer my questions so it’s really hard to help you.
You need to type out the entire API url and paste it into a web browser. If you can, share that URL with me. You can blank out the API key if you like so no one else can use it. I have my own. After you visit that url in a web browser, copy the full results you see and paste it here.
I can’t help you without the JSON response. But if you’d rather not post more details, you can watch my tutorial video where I explain how to do all of this – not how to get weather icons, but it should help you figure out how to use an API correctly.