There is also a new one that I've started using instead. Has a few nice features and you can click & drag the map around.
https://flightsim.to/file/43086/little-navmap-vr-panel
As to your problem with it. You see the web server icon running in your windows toolbar? And you also have Little Navmap open on your desktop? Even if you have the server running, you still must have the program running on your PC.
Not sure if OP found their solution, but I use LNM via the All-In-One Ingamepanels tablet in VR and it's been well for the most part.
https://store.flightsim.com/product/flightsimulator-me-all-in-one-ingamepanels-msfs/
This is the same as the "Ingamepanels pack" above, but it puts them all into the single tablet interface.