If the Google 2FA code is invalid, it may be caused by the following factors.
1 Please ensure you enter the 2FA code for the correct account if multiple accounts 2FA bound to one phone.
2 The Google 2FA code is only valid for 30 seconds, please be sure to enter it within 30 seconds.
3 Please ensure the time of Google Authenticator App on your phone is synchronized with the time of the Google server.
How to synchronize the time on your phone？（Only working for Andorid)
1 Click “setting"
2 Click "Time Correction for Codes"
3 Click "Sync now"
If the above factors can be ruled out, 2fa code is still invalid, please re-bind Google 2-Step Verification with the key in your mobile application "Google Authenticator" if you save 16-bit Google Secret Key. After rebinding, you can directly enter the 6-digit verification code to log in your KuCoin account. (Please uninstall Google Authenticator and then re-install it or delete the original binding record and re-bind it).
If you do not save 2FA 16-bit secret key, and get failure to access to your KuCoin account, please kindly click "Google Verification Unavailable? " to unbind Google 2FA