How do I register a device with Microsoft Authenticator? On the device you want to trust, go to the security settings page and sign in to your Microsoft account. You will be asked to verify your identity. Choose if you want to receive the code by email, text message, or an authenticator app. Once you have the code, enter it into the text box. You can follow these steps to add your two-factor verification and password reset methods. After setting this up for the first time, you can return to the Security Information page to add, update, or delete your security information. If you're prompted to set this up right after you sign in to your work or school account, see the steps in the article Set up your security information from the sign-in page prompt. If what you see on your screen doesn't match what's covered in this article, it means your administrator hasn't turned on this experience yet. Until this experience is activated, you must follow the instructions and information in the Set up my account for two-step verification section.