I set up my new fire tv cube following the instructions and loaded the fire tv home page and was all working fine. However when I ask alexa to change to hdmi1 (sky) she takes me there but then does not respond to me. I ask alexa a question example alexa what's the time, the cube is flashing as if responding but no sound is coming out. I have made sure the volume to the cube is on. I then say alexa change to hdmi1 ( firetv ) and she will talk through the tv only when on fire tv.
The cube will still flash blue so I know it can hear me. If I turn the tv off completely alexa will respond through the cube no problem.
I have my television using one HDMI port to my audio receiver (Onkyo) and all my devices are plugged into the receiver including the Cube .2.0. While on Direct TV ($8.95/month will stop in 3 days or so), my Cube does not appear to be responding to voice commands (no indication on the television - light or sound muting) it still responds to switch to Fire TV. I will test for a non-television command tonight to see if I have that issue.