We're sorry you're having trouble playing Radio on your Google Home devices, let's see what's going on.
What's the exact command you've used in playing radio? Have you tried reinstalling your Google Home app? Also, can you still play regular music on your speakers? Could you try resetting your speakers to see if that works?
It has nothing to do worth the command I use or my speakers. The fact is that Google have removed the availability of Radio on the media settings.
I have been on live chat with Google, uninstalled the app, I have followed all their instructions & even they didn't know the solution. They told me they would escalate it & let me know. To date, nothing!