I cannot connect my Onkyo computer to Alexa or the Echo to my Onkyo stereo through any means - which is a mystery to me.
I can connect my iPhone through Bluetooth easily, but the Echo does not. Furthermore, my Windows computer and my iPhone can connect to the Onkyo with Spotify in the .Net. Spotify will connect to the Onkyo when it recognizes the device with a menu choice, through its app.
Additionally, my phone can control the stereo using an app via wi-fi connection - and the windows computer can do the same with an app on Microsoft Windows 10.
I don't understand why I cannot connect the Echo or control the stereo, with so many other devices that are able to do so.
Can you teach the Alexa app to simply operate the Onkyo App that's already on the phone if it cannot connect directly?
Did you solve your mystery? I am having the same issue with Onkyo TX-555. I place the AVR in bluetooth and my Echo Dot can't find it. My iPhone and iPad can find the AVR just fine. Any help would be greatly appreciated.