Two-factor authentication is enabled and I can't sign in. What can I do?
The most common reason for the two-factor authentication not working correctly is that the clock on your phone is inaccurate.
This can typically be rectified by following these simple steps:
On Android devices, enable Automatic date & time option on the system:
Settings > Date & time > Automatic date & time (you can also try to set the time zone automatically)
On Apple devices, change time and date to Set automatically:
Settings > General > Date & time > Set automatically
On the Google Authenticator application, click Settings > Time correction for codes. This synchronises your phone and the application.
If the problem persists, you can do an automated two-factor authentication reset.