I don't think this problem is country specific. I'm from India and ever since I have updated to One UI/Android Pie, the beautiful edge lighting stopped working the Samsung Music app. I've tried every suggestion that has been listed here on this thread including the one full of conviction- the APK one. Nada. Nothing works.
IT IS BROKEN.
Just delete the Samsung Music app and download an older version
Version 126.96.36.199 will have it, any update after that disables the edge lighting feature.
Also, try to disable the app from updating automatically, otherwise Samsung Music will update in the background.
Thx that worked
When you update to Android Pie the Samsung Music updates, and in the update they get rid of the Edge Lighting for Samsung Music, you can undo the update for the Samsung Music but it's really unnecessary