Hello there,
scottarbough. Thanks for posting and welcome to the Community. Normally when there are problems with Alexa there are a few steps to go through to get things sorted.
Check out this helpful write-up Edward R. posted on this topic.
In this case, the Sonos One is expected to be listed twice in the settings of the Alexa app. There is one entry for the Sonos speaker part of the product, and another listing for the Alexa-enabled microphones. However, they both should be listed as online, so those steps above should help clear that up. Each have slightly different settings, and the differences may widen in the future too.
Let me know if there is anything I can help clarify. Thanks!