We are aware of an issue with YouTube accounts in Stream Deck software, where an error message appears that says "This app isn't verified" when you try to login.
Stream Deck users can still log into YouTube accounts using a special method.
When the login prompt shows “This app isn’t verified”, click on Advanced.
In the Advanced menu, click on “Go to Elgato Stream Deck (unsafe)” and proceed with the authentication process.
We sincerely apologize for any inconvenience this error has caused, and hopefully it will be resolved soon.