When you try to sign in your Google Account in some of NetEase game especially the Cyber Hunter, it now shows an error that says “Couldn’t sign you in, This browser or app may not be secure. Try using different browser. If you’re already using a supported browser, you can refresh your screen and try again to sign in” which does not allow you to sign-in through the game.
This problem usually occurs when an App developer uses the old authentication of Google called OAuth, a sign-in portal for apps and games. But due to vulnerabilities, Google started to disable this access by default. It also happens to users that has no 2-step authenticator activated to their account.
To fix this problem, you need to allow less secure access from your google account.
How to Fix “Couldn’t sign you in”
Go to your Google Account at https://myaccount.google.com/.
Then click Security tab.
Find the portion Less secure app access then click the Turn on access (not recommended).
Then switch it to turn on.
Go back to the game and sign-in again. You should able to access the game again using your Google Account.