Cant login due to security issue
Google account via admin.google.com – the Admin console.
Click the user you wish to gain access
Click ‘2-step verification’
Click ‘Get Backup Verification Codes’
Copy out the codes
‘Copy all’ to a text/Word/editor (you’ll need one shortly),
Log into the account you’re trying to access. It will now ask you to enter one of the backup codes. Do that. You’re in!