Have you already gone into Apps > Maker API > and authorized/included whichever device(s) (e.g. the one occupying id 47 on your hub) that you want to control/poll through those URL's?
You must do this prior to invoking either the Cloud or Local endpoints of that form; otherwise, Maker API will simply play dumb and issue no response to those calls.
Yes, before and after removing and reinstalling the Maker API app. I am going to try to uninstall, reboot, reinstall, select all apps and then generate the token. This was working fine weeks ago. I just came back to tinker with it for an idea I had and seeing that it's no longer working for me.
EDIT: That fixed it. Reboot after removal of app, did the trick. Working as expected now.
When you get around to conducting further tests, be sure to post a screenshot of your actual MAKER API's list of included devices, to confirm you've got the target device among them. You already know to safeguard your hub-specific private access tokens, which is smart thinking.