Sadly I can't get this to work on macOS. OBS works, NDI seems to be installed and configured. It even shows up in Chrome, but I can't select it as an option.
a) Make sure Chrome has access to cameras (System Preferences > Security & Privacy > Camera > Google Chrome checked).
b) In step 6 from my comment, make sure to try "Preview Output" in OBS's Tools > NDI Output Settings, as "Main Output" requires you to start OBS streaming/recording (which you probably don't want to do).
c) After setting up that OBS setting, clicking the NDI systray icon should show a dropdown list with a single item. You actually need to click that item in the list (it will checkmark it). If you don't do this, you'll get a black screen when trying to pull from NDI.
d) I used https://webcamtests.com/ to test – maybe try that site.
Otherwise I'm sorry, I can't imagine what the problem is.