If you see a message like the one below that says, "Let’s keep your account secure" when signing in to your work or school account, it's because your organization or Microsoft needs another way to verify your identity during sign-in.

You must sign IntegrityCheck-linked user mode PEs using Trusted Signing (formerly Azure Code Signing). 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.

Users typically sign in by using their user principal name (UPN). We are working on an update to the Mac and iOS applications to support signing in by using an alternative user identifier. To resolve this issue, update to the latest version of Mac and iOS apps.

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

Open the app, go to the app's top-level menu, and then select Send feedback. After that, contact Support or go to the Microsoft Authenticator app forum and explain the problem you're seeing and the steps you tried.

To make these assurances, the content creator must digitally sign the content by using a signature that satisfies the following criteria: The digital signature is valid.

If you see a message like the one below that says, "Let’s keep your account secure" when signing in to your work or school account, it's because your organization or Microsoft needs another way to verify your identity during sign-in.

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.

You will see sign-in requests appear either on the lock screen or in the Outlook mobile app. You'll also be able to get one-time passcodes, which you can copy/paste into other sign-in screens.

Many apps allow you to authenticate by entering a code on another device such as a PC. If you want to sign in on a remote computer to install Authenticator, follow these steps.