I believe this type of login flow will be phased out eventually. Now when we have an embedded browser (since December 2011) it would be much easier to change. There were also other reasons that I can't remember why we didn't do this. We basically needed to embed a browser in the client to make it work properly or redirect the user to a browser and then back to the client again. If youre having trouble logging in via Facebook, its always a good idea to a clean reinstallation to be sure youre on the latest app version. That was however one of the main technical problems in spring 2011 when we started to build this. I would much prefer a standard Facebook OAuth 2 authorization flow. It is not my favorite part of the client though. We worked very closely with Facebook (I helped build some parts of the backend integration). When looking at Down Detector, most users began reporting their own problems between 1:00pm and 2:00pm ET, with the issue growing even worse as time went on. I work at Spotify and was there when it was introduced (September 2011). Cant login with Facebook Im getting the error message (on the Facebook site) Login Error: There is an error in logging you into this application. There might be a few more companies that have the ability to use this login flow, but I don't know.

Thinking about differently, Facebook trusts this company enough to allow this. Then, open Spotify and try to log in using Facebook again. In the left-side menu choose Apps & Websites > look for Spotify > Edit > Delete. Clear the app from Facebook Log in to Facebook on the new device. It goes against and devalues the good policy of 'Please don't enter your password anywhere else'. Use the give username and password to log into Spotify with the new device.

Since the Facebook password is entered into a closed source client, there is no way for you to know for sure what happens without heavy reverse engineering and debugging of the client. As you have noticed, Spotify is using a different Facebook login flow that is not listed anywhere in the official Facebook developer documentation.

Spotify login with facebook not working