When I run into problems like this, I usually go to my sandbox, create a new, blank page, and then do the absolute minimum I need to test whatever I'm doing. In this case, a single API get endpoint, and a button that will call the API when clicked. If that works (I can see the request in Xano), I move up from there.
Not sure if that helps - it's a fairly basic debug / troubleshooting technique, but it may help to resolve the problem.
Another big help: in Toddle you can set the API call to auto-fetch - toggling that on and off a few times will quickly tell you what it's getting back from Xano.