When trying to use Youtube Music with Sonos One (regardless of the activation way - either iOS app or voice assistant) I am very frequently getting playback issues: it’s playing a song and then suddenly displays an error message saying “the music can’t be decoded correctly” or something similar and skips the song being played. That’s annoying, so I was forced to switch to Google Music, the last has no issues like that.
Considering the same songs can be played with no issues on Youtube Music when listening on browser or on mobile devices via Youtube Music app ( headphones, not Sonos ) I am making a conclusion that the problem is on Sonos side.