https://github.com/raywo built some nice modules but they are now unmaintained since 4 years. So there will be no fixes, may you find a fork which is still maintained.

You could may fix it using a cors proxy (google will help) or you could use the built in cors proxy of mm which is not released yet (you have to use the develop branch for this).

You find the url to proxy in this line.

also open the developers window on the auth page before login, ctrl-shift-i on the keyboard, select the console tab

http://localhost:8888

on the host opens the auth page from the container

u had to do the host address, right?

Click on “Edit Settings” and add http://localhost:8888/callback to the Redirect URIs and save your settings.

I just did this on my spotify account and it brought up the auth page as expected… and authorize click brought the page with the code in

so when u open that with your laptop browser, you should see
this page https://github.com/raywo/MMM-NowPlayingOnSpotify/authorization/public/index.html

the authorization , step 2

cd authorization
node app

should run forever

and app.js uses port 8888
so u have to run this IN the container, right?

unless u did that, that is not accessible

the request will cause a callback to that system

“When the app is running you can access it by opening localhost:8888 in your browser. Provided you are doing this directly on your Raspberry Pi”

No, I am accessing via the 192. address.