That’s odd. I’d be tempted to do a couple of things. First, reboot my speakers and my router. It could be that there is some sort of disconnect between them and the authorization server.
If that doesn’t change anything, I’d be tempted to call Sonos Support directly to discuss it.
When you speak directly to the phone folks, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.
Lately I have seeing some errors through Sonos and YouTube Music, but it happened to me like 2 years ago, try to don't close the Sonos app, if you have a Android device try to authorize in Chrome (or your browser) as a pop-up app or try to authorize it in another app, sometimes it happened to me that and if only I close the app (not completely only minimize it) it was enough to don’t response again. Try it :)