'Spotify Android SDK - SpotifyAppRemote Issues

I am trying to follow the "Quick Start" guide found here as closely as possible. I have retreived the SHA1 fingerprint, I have registered my app on Spotify's dashboard, I have done everything exactly as detailed in the guide. However, everytime I run the app, the log in window that is supposed to pop up for the user to authorize the application never pops up.

After that I tried using the code found here to see if my application is even authenticaed. I get the following reponse code: AUTHENTICATION_SERVICE_UNKNOWN_ERROR. I have tried debugging this in so many ways but I have no idea what is happening. If someone was able to get the Quick Start guide working, could you please help me out?

Thank you.



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