Updating to Google’s login security is preventing authorised access for some users. Try again won’t work either.
It is easy to resolve.
First you need to log into the master Google account via admin.google.com – the Admin console.
- Click ‘Users’
- Click the user you wish to gain access
- Click ‘Security’
- 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 out.
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!