Microsoft Edge: Allow M365 authentication popups in work profiles
Microsoft Edge will now allow authentication popup windows from Microsoft 365 sites by default for work account users. Admins can control this behavior through the M365AuthPopupsInWorkEnabled policy if they need to restrict or manage popups.
Microsoft's description
When users are signed in with a work account, some Microsoft 365 sites (for example, microsoft.com, cloud.microsoft, and microsoft365.com) may open authentication pop-up windows to Microsoft sign-in endpoints such as login.microsoftonline.com, login.live.com, or login.microsoft.com. These pop-ups are required to complete sign-in. Microsoft Edge now allows authentication pop-up windows from Microsoft first party services by default. Admins can control availability to this feature using the M365AuthPopupsInWorkEnabled policy.