If you enter your six-digit 2FA code correctly within the 30-second time limit and still encounter a “2FA Google Auth is invalid” error, it could be that your 2FA application is not properly synchronized with your device's time zone settings or the network time.
*** To fix this, enable network syncing under Date & Time settings on your device.
Go to System > General Management > Date & Time
Switch on "Automatic date and time"
Go to Settings > General > Date & Time and switch on "Set Automatically".
*** If the error persists, we recommend you delete your 2FA entry and create a new entry using the QR code or the manual key.
In case you have tried all the steps above but the 2FA is still locked, please submit your request together with photos for verification through this link so that our team can assist you further.
(The instructions with examples can be found here.)