Hi @aalex10, thank you for reaching out, and welcome to the Sonos community. I appreciate you for letting us know about your concern. Let me help you with this.
I'd like to ask some questions to isolate the issue so we can create a path towards resolution.
1. What browser are you using when you get this error? Have you tried using other browsers?
2. Have you tried clearing browser history? Did you get the same error?
3. Have you tried other devices?
4. Turn off and on your devices and try checking it again.
Let us know how you get on with the advice above. We'll wait for your reply.