yeah the line got lost...
just add the line "Console.WriteLine("Refresh Token: " + tokenResponse.refresh_token);"
to the Login/GoogleLogin.cs:
await Task.Delay(2000);
tokenResponse = await PollSubmittedToken(deviceCode.device_code);
} while (tokenResponse.access_token == null || tokenResponse.refresh_token == null);
>>>>HERE<<<<
return tokenResponse;
then save and start, now the Token will be shown in the Console after und entered the Device-Code