If you try to sign in using a passkey and see the error message "We couldn't use your device to verify your identity," it means the passkey is no longer valid on that device.

[INVESTIGATING] Invitations might be sent twice from an Outlook mobile app when a new attendee is added to a meeting [INVESTIGATING] Updating the location for an instance of a recurring event doesn't sync with Outlook Mobile Calendar

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.

When you send a digitally-signed macro or document, you also send your certificate and public key. Certificates are issued by a certification authority, and like a driver’s license, can be revoked.

Outlook for iOS will detect a sync error and will ask you to enter your password again. If you are having difficulty getting Outlook for iOS to sync with your new password, delete your email account and then re-add it.

Signing in with a passkey is simple and fast and helps protect you against phishing attacks. Passkeys are supported on desktop and mobile browsers (mobile app support is coming soon).

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.

If you see the error when trying to sign in with a Microsoft app, delete or uninstall the app. Then reinstall the latest version from Google Play, the Apple App Store, or the Microsoft Store for your PC.

If you don't see the Sign Message button, you might not have a digital ID configured to digitally sign messages, and you need to do the following to install a digital signature.

If for some reason you're unable to use your primary sign-in method, you can use another previously set up verification method. Sign in to your account normally, and then choose the Sign in another way link on the Two-step verification page.