I followed all the steps and I had no problems during the process. After I authorised the app, I got the following message:
Your app is now authorized. You can start using it with your MagicMirror.
Step 3: Configure your mirror
Now copy the following snippet into your config.js file and your good to go.
(I replaced the digits with dots above for security reasons)
I copied the snippet into the config.js file and ran the MagicMirror using Google Assistant. However, everytime I try to invoke Spotify, I get a message from Google Assistant that first I have to enter the Spotify credentials - which I already have. I have also inserted the Redirect URIs.
When I use Spotify on my mobile, the cover image and info about the track being played is displayed on my MagicMirror.
What am I doing wrong?