If you have enabled two-step verification for your account, you then need to enter your One Time Password during the sign in process to access your account.

If you already know how to sign in to your account and you have entered your account name and credentials here, you will be asked to enter your Google Authenticator token.

This is the 6 digit code which is shown on the Google Authenticator or similar application you used to set up your two-step verification on your account. 

Useful links

Enabling Two Step Verification

How do I sign in to my account?

Google Two step verification

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