Hey @rres788jj5f0rcr!
Thanks for reaching out to us.
Our team is currently looking into this issue, but in the meantime, try to go to Facebook > Settings > Apps, and remove Spotify.
You should then be able to log in by clicking the blue "Log in with Facebook" button and authorize Spotify again.
Let us know how it goes.
“Music acts like a magic key, to which the most tightly closed heart opens.”
― Maria Augusta von Trapp