Once you have linked your account, remember to make Spotify your default music service and then simply say "Alexa" and then, "Play Spotify", or "Resume Spotify" to get the music started.
Spotify - Home screen
Or just say "Alexa", then...
Spotify - Now playing view
Product Features● Get your music on the big screen, free● Enjoy podcasts too● Browse albums, songs and playlists● View cover art on-screen● Easy control from your TV remote● Or with Spotify Connect on your phone or tablet● High quality audio, no ads (Premium only)
Spotify - Your library
Spotify - Album list view
You can now watch video podcasts on many Amazon Fire TV devices
Come home to ad-free, on-demand music. Listen in the highest quality.