General

The Authenticity Seal Validator App is a Teams application that enables users to validate the Authenticity Seal shown on the login screen. This seal changes monthly to make it harder to copy.

This app should be made available to all users via the global Teams app setup policy, so that employees can independently verify the seal and ensure they are on legitimate Microsoft 365 login pages.

Rationale

The Authenticity Seal is intended to help quickly recognize the legitimate Microsoft login page. But to prevent it from being copied, the seal must change regularly. And in case of doubt, an employee must be able to independently validate whether the displayed seal is correct.

Attic Fix

For this check, an automated FIX is available! If Attic has write access to your Microsoft configuration, the fix will be suggested via an Attic ticket.

More information