1. Following popup appears when you failed to login to Google

2. Or your Android version is 6.0(Marshmallow) and you did not give permission to 'Access Address'

These two are usually the biggest reason.

Check your Android version and if it is above 6.0, check whether permission to access is not granted,

If it is not 6.0, click the Guest Login button first and enter the game.

Go to [Main Lobby]-[Settings]-[Device Sync]-[Google play not connected]

Choose the Google email you have been using and try to sign in again!

If none of the following solves the issue, if you could somehow sign in, go to [Main Lobby]-[Settings]-[Inquiry/Report] and send us an inquiry or contact us at cs@nimbleneuron.com and we will look for solutions as soon as possible.