What if I lost my verification code?
Revoke lost backup codes
If you lost your backup codes, you can revoke them and get new ones. Go to the 2-Step Verification section of your Google Account. Select Show codes. Select Get new codes.
Is there another way to get a verification code?
Get a text or phone call
If you don't have a trusted device handy, you can have a verification code sent to your trusted phone number as a text message or phone call.