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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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 ...

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若要在 Apple 设备上使用 Xbox Cloud Gaming，请按照以下步骤操作或观看视频： 视频说明 有关云游戏和要求的详细信息，请访问： 如何使用云游戏

在 Apple 裝置上進行雲端遊戲 全部展開 在您支援的網頁瀏覽器上播放 請確定您具備最低系統需求

Microsoft Support

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

Learn how you can use the free Microsoft Authenticator app to sign in to all your accounts without using a password.

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

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.

Learn how to install the Microsoft 365 Copilot mobile app on your iPhone or iPad and use the apps with Microsoft 365.