Here is what you do, go onto the spotify app on your chromebook and click on the 3 dots on the right hand corner, then click on app info. Once you do that, click allow protected content. and then refresh the app. Now it should be working! If youre on the web player on chrome browser then just press on the lock symbol on the left hand side of the url on top, then allow protected content right there. Refresh. Now it should be working for you too!