For instance, if I ask it to play Taylor Swift's "Blank Space" or "Bad Blood", it says, e.g., "Okay, putting on Taylor Swift's 'Blank Space'". However, the song is then immediately paused before it even starts playing, and a window is shown, saying that "Playback paused because this account is being used in another location". However, this is wrong; my account is not being used elsewhere, and most other songs work fine.
On closer inspection, I realized that the version of Blank Space it puts on is called "Blank Space – Taylor Swift ⋅ 1989 (Deluxe Edition)". No song with exactly that title shows up when I search through Youtube Music manually (in the EU); the version of Blank Space I can access is not called anything with Deluxe Edition, and it plays just fine on my Sonos if I put it on via my smartphone. This is what makes me think that there is some regional restriction on the songs and that Sonos for some reason automatically loads a version from the US region by default rather than the local EU region. I think this has to be a bug.
Best answer by melvimbe