Sign in using Microsoft Authenticator | Microsoft Support Sign in using Microsoft Authenticator Microsoft Authenticator helps you sign in to your accounts if you've forgotten your password, use two-step verification or multi-factor authentication, or have gone passwordless on your account
Troubleshoot problems with Microsoft Authenticator Troubleshoot problems with Microsoft Authenticator You can resolve problems with Microsoft Authenticator by checking the tips in this article and reviewing some of the known errors
Microsoft account security info verification codes Microsoft is committed to advancing security standards and as such, we will start phasing out SMS as a method of authentication and account recovery for personal Microsoft accounts
How to use two-step verification with your Microsoft account About two-step verification and authentication for Microsoft accounts What is two-step verification in Microsoft accounts? Two-step verification (sometimes called multi-factor authentication) helps protect you by making it more difficult for someone else to sign in to your Microsoft account
Protections for CVE-2025-26647 (Kerberos Authentication) In this article Summary Take Action altSecID attributes Timeline of changes Registry Settings Audit Events Event ID: 45 Event ID: 21 Known issue Summary The Windows security updates released on or after April 8, 2025, contain protections for a vulnerability with Kerberos authentication This update provides a change in behavior when the issuing authority of the certificate used for a security
Sign in using two-step verification or security info Set up security info to use an authentication app Set up security info to use text messaging Set up security info to use a phone call Set up security info to use a security key Sign in using an authenticator app notification on your mobile device Sign in to your account with your username and password
2-Step Authentication - Microsoft Support 2-Step Authentication To enable 2-step authentication verification: Go to the Outlook com website and log in Select the gear icon Go to Options > Account details (top of the list) You may be asked to sign in