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

Using Authenticator as a way to sign in If you have turned on passwordless, two-step, or multi-factor authentication for your account, use the following steps to sign-in: Go to the site where you want to sign in. Enter your username at the sign-in prompt and select Next. Select Send notification.

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

Choose your alternative verification method, and continue with the two-step verification process. After you're back in your account, you can update your verification methods (if necessary). For more info about add or changing your methods, see the Manage your settings for two-step verification article. Next steps Learn about your security info in the Security info (preview) overview article ...

Learn how to set up your user account for multifactor authentication with Microsoft 365.

Important: With two-step verification, you always need two forms of identification. This means that if you lose your phone, your password alone won't get you back into your account. For that reason, we strongly recommend you have three different sign-in methods associated with your account.

KB5005413: Mitigating NTLM Relay Attacks on Active Directory Certificate Services (AD CS)

Meet Microsoft Rewards! Learn all the ways to earn points towards awesome rewards in this quick overview.

如果無法登入您的 Outlook.com、Hotmail、Live 或 MSN 電子郵件帳戶，或者您不確定如何登入或登出，這裡提供一些解決方案。 如何登入您的Hotmail 或Outlook.com帳號 要登入 Outlook.com 或 Hotmail，你需要你的Microsoft帳號使用者名稱和密碼。 登入 故障排除：無法登入 Hotmail 或 Outlook.com Microsoft 會始終關注不常見的 ...

Learn how to sign into your PC with Windows Hello using a PIN, facial recognition, or fingerprint.