Sorry to hear about this concern persisting, neighbors! If you have not already tried, please ensure the microphone is toggled on your Echo device screen. You will see in our help center article, there are a few commands that will initiate two way audio. Check out the tips there to see if they work for you.
If none of those methods or troubleshooting steps work, try removing and re-adding the Ring skill to the Amazon device/ app. Please also ensure that your Alexa device is within range of your router’s wifi signal. Additionally, try out the two way audio on different event types, such as live view, motions, and/ or Video Doorbell rings. Feel free to let us know how this goes!