Hello,
You know that on the login page, where you are asked for the code received by SMS, there is a checkbox "approve this computer" (this is translated back, as I have this page in French -it is the only one, by the way).
It appears it is checked by default, is that an error ?
To roll that back, I got back on that page with the history of my browser, and unchecked.
My wifi card ceased functioning just at that moment, I had to restart my machine a few times (that already happened a few months ago). This is how I did not immediately know it was efficient to "roll-back" thanks to the history of the browser.
Hum, if there is no interface to manage that afterwards, I imagine it is no good idea to approve the computer at the office.
Well, if you approve your computer at home, perhaps you can have a problem when you sell it ?