Working from home is increasingly part of our working lives, and poses no problems for OpenAthens - you won't need VPNs or proxies to access the administration pages.
When you sign in from an unknown location you will trigger an email to your registered address.
Copy the code from the email into the box and you'll be signed in. This will cover you for up to 5 days at your current location, but you may see it more often if your location appears to change.
See also: About multi-factor authentication
If you don't have access to the password - e.g. saved in your browser on your work computer - a fellow administrator will be able to reset it for you. If there is no-one available who can, contact your support provider. If you are contacting them by telephone you may be asked for a 4 digit pin from the organisation record, so you should make a note of this before you need it.
Codes can only be used once and must be used within an hour (from the time they're generated). If you're confident that neither of these are the reason a code hasn't worked for you, please contact your usual support provider.