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Please add a functionality that tells us what other device is being used when you display the error that "Someone else is listening."
This would help prevent the freak out moment that some unauthorized user has hacked my account, and possibly my payment information, by actually seeing what device is being used. I never really know if I need to secure the account or if it's just my family using the Alexa at home.
With that in mind, you might consider giving us the ability to forcefully log out all devices on the account via Settings menu as I've seen with other streaming services.