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  1. Download Microsoft Authenticator - Microsoft Support

    The Microsoft Authenticator app helps you sign into your accounts when you're using two-step verification.

  2. Sign in using Microsoft Authenticator - Microsoft Support

    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.

  3. About Microsoft Authenticator - Microsoft Support

    This is called two-step verification or multi-factor authentication. As the only way to sign in - just tap an approval on your phone to sign in. This is called going passwordless. Just follow the …

  4. How to add your accounts to Microsoft Authenticator

    If your organization supports two-factor verification or multi-factor authentication sign-in, you can set up your work or school accounts to use Authenticator as one of the verification methods.

  5. Protections for CVE-2025-26647 (Kerberos Authentication)

    Apr 8, 2025 · While in Audit mode, Event ID: 45 will be logged on the domain controller when it receives a Kerberos authentication request with an unsafe certificate. The authentication …

  6. What is: Multifactor Authentication - Microsoft Support

    Wondering what multifactor authentication, sometimes known as two step verification, is? This article will explain it clearly.

  7. How to use two-step verification with your Microsoft account

    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.

  8. Microsoft Authenticator in Link to Windows

    Conveniently and securely sign in to all your online accounts using multifactor authentication, passwordless sign-in or password autofill with Microsoft Authenticator.

  9. Kerberos and NTLM authentication failures due to duplicate SIDs

    Aug 29, 2025 · Cause Windows updates released on and after August 29, 2025 include added security protections that enforce checks on SIDs, causing authentication to fail when devices …

  10. Contact - Microsoft Support

    The Microsoft Authenticator app backs up your account credentials and related app settings, such as the order of your accounts, to the cloud.