Microsoft Authenticator
A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation.
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We use conditional access with MFA for external access to all Microsoft365 services. We want to setup MFA with our on prem Gateway server. NPS is installed and configured on another server, when enabled the user never receives a push notification from the Authenticator app and eventually times out. There are no errors in the event viewer.