Follow the following video tutorials explaining how Alexa Bridge works and how to set it up with a RM Pro
English: https://youtu.be/QUKYKhK57sc (Thanks to Adam Lobo)
English: https://youtu.be/DJIhEyMQ0TI (Thanks to Paul Hibbert)
German: https://youtu.be/CD9sYrTDeyI (Thanks to Vernix)
You can subscribe to their channel for more advanced videos.
Please note that Alexa Bridge only works with real Amazon hardware like Echo, Dot & Tap.
All Amazon Echo simulators (such as Reverb app, EchoSim.io) can only control existing discovered devices, they are not able to discover new devices.