Decision number 1.
Google Authenticator may not have synchronized time.
To resolve the issue, follow these steps:
Open the main menu of the Google Authenticator app.
Click Time correction for codes.
A confirmation appears on the screen. Now you can use the codes to sign in to your account. Synchronization only affects the internal time of the Google Authenticator application and does not affect the device's date and time settings.
Decision number 2.
Authy is an improved application for 2FA.
You can download it for your mobile device in the App Store or Google Play or install a browser extension for Chome (available for Windows, Mac, Linux).