8] Reinstall Amazon Prime Music If you have the Amazon Prime Music app installed on Windows, macOS, Android, or iOS, try reinstalling the app and see if the issue persists.

Separately, other users are reporting the same issue, but to do with the Amazon Music app. In each case, attempting to launch the app or to just use the Mac, brings up a dialog box.

The Amazon Music app has been around for years and has supported connecting to a number of external devices for music playback. But Google's Chromecast wasn't one of them until now.