Multiple Echo Dot Connections and Communication Issues

I recently set up multiple Echo Dots in my home, and while they appear connected in the Alexa app, I’m encountering some puzzling issues. When I prompt one Echo Dot, it seems to drop into another, but there’s no audio communication between them. The same problem occurs when trying to communicate between an Echo Show and a Dot. The only successful interactions I’ve had are through the phone app using announcements. I’m wondering if there’s a specific setting or configuration I’m missing that would allow seamless communication between these devices. Has anyone else experienced this and found a solution? I’d greatly appreciate any advice or insights!