Chessnut down?

Looks like it may be, try using Chessconnect to play games.

Yes, there are known connectivity issues with the Chessnut app and Chess.com. As for "authorization errors", you can go to your Chess.com account --> settings --> security, and add a new password; this allow you to login using both your Google account and email+password. Then in the Chessnut app, login using your email and the new password (not Google login). As of "connection issues", some users had to create a new Chess.com account directly (not linked via Google) to resolve. And finally, make sure you're using the latest "New Chessnut" app. As an alternative, you can use Chessconnect. Ciao