Mr P White

Hi Peter, 

Welcome to Box Community and glad to assist!

Are you able to still login on box.com? If so, you can disable your Multi-Factor Authentication. 

emove a multi-factor authentication method from your individual account:

1. Click on your account icon in the top-right corner of the page, and select Account Settings.
2. Under the Account tab, scroll to the Authentication section.
3. Click Remove next to the authentication method you want to remove, and then click Remove in the confirmation dialog box.

Next, re-enable MFA. 

Hope it helps!