When you try to view or edit sensitive info related to your Microsoft account—like your credit card details—we might ask you for a security code first, to make sure that only you can get in to your account. But if you use a device often you can designate it as a trusted device. On trusted devices, you don't need to enter a security code each time you try to access sensitive info.
You can mark a device as trusted just by selecting a check box. When you're prompted to enter a security code to verify your identity, select the I sign in frequently on this device. Don't ask me for a code. check box, and we'll no longer ask you for a code when you sign in on that device.
Here's how to mark a device as trusted:
On the device you want to trust, go to the Security settings page and sign in to your Microsoft account.
You'll be prompted to enter a security code. Choose whether to receive the code through email, text, or an authenticator app. Once you have the code, enter it in the text box.
Select the I sign in frequently on this device. Don't ask me for a code. check box, and then tap or click Submit.
You can now edit your info on this device whenever you want, without entering another security code.
If you no longer have access to a device you marked as trusted (for example, if your laptop is lost or stolen) we recommend that you remove all trusted devices from your Microsoft account to help keep your account secure. (You can always trust devices again later.
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. 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.