I have a echo spot and a fire tv cube. And I have created a multi-room music group on Alexa app. I added both my Alexa echo spot and fire tv into my living room group. My issue is when select my living room group on my Spotify connect; music only plays on the echo spot and not on the fire tv cube. All I see on the fire tv is artwork displayed of what is being played but will not play. What is wrong ?