To use OBi with Google 2-step authentication, go into your Google Account settings, under Security - Authorizing applications & sites, click edit. 2/3 down the page, enter a name (anything - this is a password for your OBi to use) and click Generate password. Copy the resulting password and paste it into SPx Service -> AuthPassword of your OBi. You don't need to remember this password, you won't be using it anywhere else. If you ever need to reset your OBi, you can go back into your Google account and revoke the password and generate a new one.