Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
I am having the same problem. Going to amazon.com/code, and successfully entering the code (regardless of device - I've tried IPhone, Android tablet and Chromebook) does not activate the Roku Amazon Music app. I have confirmed this problem on different TVs, with different Roku devices.
I have NO trouble with the Amazon Music app on APPLE TV devices.
Amazon Music on Roku is now working for me again, although I had to highlight the channel on my Roku device, click the star/asterisk (*) button on my remote, and select "check for updates." Once the updated channel downloaded, it started working again.
I called Amazon Service today and he told me they are having problems with the Amazon music on the Roku tv. He reset it, but it still didn't work. He said wait 24 hours. I then saw the other response to go to the app click on the * on your remote and it updates the apps on your Roku tv. I then had to enter a code on amazon.com/code.