I listen to Spotify via Amazon Alexa, and I have been a loyal Last.FM user for over 10 years, unfortunately there is currently no way to "scrobble" tracks played via spotify via amazon echo.
Back in the day, Rdio implemented scrobbling to Last.FM on the server side, meaning, rather than letting the client handle scrobbling, the scrobbling was handled universally by the server whenever you played a track so didn't have to have a scrobbler installed on every client. This would be a useful potential approach, either that or a dedicated option to turn on scrobbling for tracks played from an Echo.
Your idea has been submitted a while ago but unfortunately hasn't gathered enough kudos (100 per year). In order to keep an overview of the active & recent ideas in this forum, we will close this idea for now. However this does not mean that your idea has been declined by Spotify.
If you still feel strongly about your request, we encourage you to post your idea in a little different form again! Maybe now is the right time to receive the support of our community for your suggestion! ;)
Do you have any further questions on how the idea exchange is managed? Just click here!