When using my Calm subscription on my Sonos system, I’ve noticed many music options available on the Calm app are not available on Sonos. For example, on the Calm App or on their website (from a browser) there is a music selection called “Gently Back to Sleep”. That is not available under any of the categories listed under Calm on the Sonos app.
Similarly, Calm has its own concept of Favorites and there is no favorites category under Calm on the Sonos app.
Honestly I’m betting this is a limitation with the integration between Calm and Sonos but I thought I’d check here to see if others have encountered this.