Tried about 25 times and finally got through with the "integration" password process within the app. However, Spotify tab shows a spinner then says "Unable to navigate to the music service." Pandora, iHeartRadio, Deezer, and Amazon Music all work flawlessly as usual. Really missing Spotify today...
Mine is fixed!! Now I can link to the Spotify thru Bose Music App and also play the music.
Not sure whether they fix it or it is because I did something.
I saw this article: https://community.bose.com/t5/Wave-Systems/Spotify-problems/m-p/252897
and suddenly remember there was a Spotify update on Thursday, so I delete my Spotify App and reinstall, and it magically works and Bose Music links to Spotify.