Microsoft updates Groove Music so not all features are available in all markets
The latest update for Groove Music improves the experience for those who are listening to the music while offline. Also, it disables some features in some countries, or at least that's what the official changelog mentions.
According to Microsoft, “not all features are available in all markets,” so if you previously had some issues with a particular feature that did not work as intended or not at all, then this might be one of the reasons.
Some Groove Music features seem to be limited to some markets and may not work correctly or not at all in other regions. The latest update is meant to highlight this fact for those who couldn't take advantage of some of the app's features.
Another important change included in the update makes it easier to see what's playable when you are offline. The developers also mention that when you are connected again, online pages are automatically refreshed.
These are all the improvements announced for the newest Groove Music update for Windows Phone devices, but expect new features in future updates.