I've tried following the instructions for setting up the Alexa-Sonos integration. Alexa finds all the Sonos speakers, so that much works.
However, when I try to say for example "Alexa, play [TuneIn show] in the Living Room", Alexa plays TuneIn in the living Echo instead of the living room Sonos. This happens with all the Sonos speakers I have. Alexa always plays it on one of the Echos.
The Echos were originally named "Living Room Echo" etc, but I changed that to see if the problem was conflicting names. No luck.