
You won’t be able to receive any text (SMS) messages when your mobile device has no signal. When your mobile device has no data, you will not be able to receive these push notifications. When push notification is enabled for the Microsoft Authenticator application you would receive a notification on your device which you can approve or deny to complete sign-in. This could be an issue with data connectivity only or complete connectivity issues on the mobile device such as having no signal. The scenario for this would be that you have connectivity on your workstation to access cloud applications, but your mobile device has no connectivity.

The Authenticator application functions as the primary and backup sign-in method.

You can use the Microsoft Authenticator application to complete MFA (Multi-Factor Authentication) sign-in when your mobile device has no connectivity.
