To fix the issue: Set up a new passkey. Check the authenticator app on your mobile device for any passkeys that no longer apply and delete them. "Sign in another way. We couldn't use your device to verify your identity" message.

Build a "Can't sign in to Outlook mobile" checklist. If you can't sign in to your email account on the Outlook mobile app, get help for the account you're trying to sign in with. If you can't sign into your Microsoft account, most issues can be identified by our sign-in helper tool.

このエラーが発生した場合は、場所マスク テクノロジを使用せずに、トランザクションがアカウントのホーム リージョンから発生している必要があることを示します。 そのためには、次の手順を実行します。 VPN から切断します。 それでも接続できない場合は、このページの右側にある [お問い合わせ] ボタンを使用し、エラー コードを共有します。 詳細については、以下の「VPN ポリシー」セクションを参照してください。 この購入エラーについてのヘルプに関しては、このページの右側にある [お問い合わせ] ボタンをご利用ください。 "サーバー側で問題が発生しました。 しばらくお待ちください。 Web の場合: ページを更新し、もう一度やり直してください。

Learn how to fix the error "Sorry, something's wrong with your Microsoft account" so you can sign in to the XBOX network.

Copilot will create a download link for the file. Select the link and you will be redirected to the appropriate mobile app to open and edit the file. If you don’t have Word, Excel, PowerPoint, or OneDrive currently installed, you can find them in your app store, available for both iOS and Android.

Microsoft has discovered a vulnerability in Office Visual Basic for Applications (VBA) macro project signing. This vulnerability might enable a malicious user to tamper with a signed VBA project without invalidating its digital signature.

Microsoft is updating the Windows code-signing infrastructure to replace expiring certificates (CAs), strengthen signing algorithms, and prepare for post-quantum cryptography (PQC).

The cross-signing program is deprecated and new signing certificates will not be issued. Windows will continue to trust the existing binaries signed by the cross-signing program.

A set of unsafe default configurations for LDAP channel binding and LDAP signing exist on Active Directory domain controllers that let LDAP clients communicate with them without enforcing LDAP channel binding and LDAP signing.

Starting July 13, 2026, Microsoft 365 subscribers on macOS, iPhone, and iPad, and those with non-subscription software, including Office 2021 or Office 2019 on macOS might notice that Office apps (Word, Excel, PowerPoint, Outlook, or OneNote) can open and print files, but cannot edit, save, or create new files – called “reduced functionality mode”.