Dont know if anyone else is having issues connecting to spotify in car, but the latest release has generated an error with the BMW app. Its a known issue with Spotify that is being worked on, see link:
https://community.spotify.com/t5/Ongoing-Issues/BMW-integration-with-3-0-0-iOS-app/idi-p/1123705
https://community.spotify.com/t5/Ongoing-Issues/BMW-integration-with-3-0-0-iOS-app/idi-p/1123705