Date: July 11, 2017
Spotify recently updated their Terms and Conditions (T&C) and requires each Spotify user to accept it.
If you haven't yet accepted their T&C - and are trying to log into Spotify via Melody, Spotify app will break the log-in flow.
To solve this, please accept the T&C by opening the Spotify app. first and then come back to Melody to log in via Spotify.
Since the issue is with the Spotify app. - we are also monitoring Spotify's issue list and will update this FAQ once it is resolved by their team.
If this does resolve your issue, please contact us at firstname.lastname@example.org so we can help you successfully login with Spotify.