I think the only knowledge Sonos has here is to go to PocketCast’s server, and provided whatever content they are presented with. To my knowledge, they do no filtering / choosing of what data to present to you, that’s all on PocketCasts. Have you contacted them?

Yes. They said to ask Sonos.

Interesting. I wonder why? 

Everything plays fine from the Pocketcast app. Those specific podcasts only don't play when I try to listen to them on Sonos.

I’m seeing the issue too with Bill Burr's Monday Morning Podcast FWIW. I would have thought though it was a Pocket Casts issue as they are responsible for the data they provide to the Sonos API - other podcasts I tried are working okay.

Diagnostic Report: 1099452473

To my knowledge, PocketCasts uses a different server to feed the Sonos connection, likely for tracking purposes, but that could be why it’s exposed on their own app, but not through Sonos. 

It's exposed - it shows up in the New Release list on Sonos, the name and icon are there. Sonos sees it, it just doesn't play it. Same on both the Sonos  Android app and the Windows app.

Some kind of (read) ‘permission’ issue on the Pocket Casts server would be my guess… they need to change it to give access to Sonos users, perhaps?

Certainly worth submitting a diagnostic to Sonos, and calling them with the particular names of the podcasts, as well as notifying PocketCasts themselves. Just not convinced there is a lot that Sonos can do, since they don’t control what is exposed to their client.