I have spent about 4 hours or so, going through every troubleshooting step I can find, and at times, Spotify will work and it will start playing. Then I do something else, and it stops working again. My diagnostic is 442930686.
I have removed facebook from my account. I have removed and re-added all the speakers. I have gone from wired to wireless. I have adjusted my network settings for STP. Everything else works, TV, Sonos Radio, just Spotify has issues.