There are a number of possible explanations for why verification codes don't always arrive. Read through the list of the most common causes, and see if any of them apply to you, or use our troubleshooter to help guide you.

Contact Microsoft Office Support for assistance with Microsoft 365, Office, Windows, Xbox, Surface products and more.

You can repair some apps and programs if they're not running correctly. Note that you won't see repair, change, or modify options for all apps and programs.

PC または Mac に Microsoft 365 または Office 2019 をインストール、再インストール、またはライセンス認証する方法について説明します。

Learn how to access Windows device security settings in Windows Security to help protect your device from malicious software.

了解如何使用产品密钥或数字许可证激活 Windows、检查激活状态，以及链接Microsoft 帐户。

Change two-step verification settings; Common problems with two-step verification for work or school accounts; Manage app passwords for two-step verification

Learn how to connect the Xbox Wireless Controller with your Xbox console.

Get help with signing in, changing passwords, creating and sending mail, deleting mail, creating folders, and more in Outlook on the web.

Learn how to use antivirus protection in Windows Security to protect your Windows PC against malware, viruses, and other threats.