I'm making the same move you made yesterday. Just to torture myself, I thought I'd first try Apple Music. JesusHCrhist. I managed to move everything over but it would not play at all with my Sonos speakers. I guess apple has its own speaker system. So I'm moving the tunes from Spotify to Amazon as I write this. If it plays well with Sonos, I"m good.

I'm pretty sure it works with Alexa/ : )