What happened to the list of trusted devices on my security info page?
Microsoft has made some changes to how you keep track of your trusted devices. For example, you no longer have to provide a unique name for each trusted device (or remember which is which!) You can also trust as many devices as you want—there's no longer a limit.
For these reasons, we've removed the list of trusted devices from the security info page. If you don't sign in to a particular trusted device at least once every two months, we'll automatically remove it from your Microsoft account. This helps keep your account secure in the event that a trusted device is lost or stolen without you realizing it. You can always trust a device again later.