Certificate authority (CA) A certificate authority is an entity similar to a notary public. It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired. Top of Page Digital signature assurances The following terms and definitions show what assurances are provided by digital signatures. Authenticity The signer is ...

你可能会因异常活动而被阻止。 Microsoft通过评估每次登录、注册或客户互动的可信度和可信度来保护你、你的帐户和我们的服务。 如果你的作触发了警报或与典型模式明显偏差，我们可能会将其解释为潜在风险行为，从而导致我们不会发送代码的临时阻止。 可能会有来自你的地理位置 的严重受损 ...

Learn how to add all your different accounts to the Microsoft Authenticator app.

Check the Xbox services, games, and apps for any service outages.

See how to view the details for signatures and certificates.

If your organization is using multi-factor authentication (MFA) for Microsoft 365, the easiest verification method to use is the Microsoft Authenticator smart phone app. It's just one click instead of typing in a 6-digit code. And if you travel, you won't incur roaming fees when you use it. Download and install Microsoft Authenticator app Download and install the Microsoft Authenticator app ...

Learn what you can do if you're not receiving account aign-in verification codes.

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

使用 Authenticator 登入 如果您已開啟帳戶的無密碼、雙步驟或多重要素驗證，請使用下列步驟登入： 移至您要登入的網站。 在登入提示中輸入您的使用者名稱，然後選取 [下一步]。 選 取 [傳送通知]。

摘要 本文解釋了為什麼 Microsoft 的驗證碼不一定能送達。 其中包含最常見的原因清單，以及每種原因的解決方案。 驗證碼不一定能及時送達的原因 請閱讀以下最常見的原因清單，看看是否有適用於你的問題，或使用我們的故障排除工具來指導你。 開始