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Microsoft Authenticator needs working push notifications and a correct device configuration for phone sign-in to work. Use these checks and fixes:

1. Verify notifications on the phone
   • Make sure the phone is not in Do Not Disturb/Quiet mode.
   • Check system Settings → Notifications and confirm that Microsoft Authenticator is allowed to send notifications (banner, sound, vibration as desired).
   • Confirm other apps can receive notifications. If no apps receive notifications, fix the phone’s notification or network issue first.
2. Check network connectivity
   • Ensure the phone has a stable internet connection (Wi‑Fi or mobile data).
   • If notifications still do not arrive, switch between Wi‑Fi and mobile data and try again.
3. Fix “no notification when app is closed”
   • If notifications only arrive when the app is open, check battery/energy‑saving settings and exclude Microsoft Authenticator from aggressive background restrictions so it can receive push notifications when closed.
4. Ensure the app and device time are correct
   • Update Microsoft Authenticator to the latest version from the store.
   • Set the phone’s date and time to automatic and correct time zone, then restart the device. Incorrect time can cause “expired” or failed notifications.
5. Re-add the account in Authenticator (if only some accounts fail)
   • If notifications work for some accounts but not others, remove the problematic account from Authenticator and add it again, allowing notifications when prompted.
6. If the error persists when enabling phone sign-in
   • After completing the steps above, try enabling phone sign-in again.
   • If the app still shows an error when turning on phone sign-in, use another verification method (SMS, email, or security key) to sign in and then manage your sign-in options from the account security page.
   • For work/school accounts, contact the organization’s IT admin so they can review MFA settings or reset the sign-in methods if needed.

References:

• Troubleshoot problems with Microsoft Authenticator
• Microsoft Authenticator FAQs
• Authentication did not complete