How to fix my 1 of two accounts in Authenticator

This usually happens because the sign-in approval is still tied to the device or account registration that was last used, so the push goes to the wrong Authenticator setup.

Try this in order:

1. Check whether the approval is being sent to the other phone.
   • If the other phone still has Microsoft Authenticator active, the prompt may be going there instead of the current phone.
   • If possible, open Authenticator on that phone and see whether the sign-in request appears.
2. Use another sign-in method if one is available.
   • On the sign-in screen, choose a different verification method such as SMS.
   • This can get access back without relying on the wrong Authenticator registration.
3. Remove the old phone or outdated sign-in method from security info.
   • Old Authenticator registrations can keep receiving prompts until they are removed.
   • For work or school MFA, remove the old phone entry and then add the current phone again.
4. Re-register the current phone in Authenticator.
   • If the account was restored to a new phone, work or school accounts still require signing in again.
   • If Authenticator shows “Sign in to add your account”, open that account in the app and sign in again.
5. If push notifications are failing on the current phone, verify the app and device settings.
   • In Authenticator, make sure notifications are enabled.
   • Confirm the phone has network connectivity.
   • Update Microsoft Authenticator to the latest version.
   • If needed, restart the phone.
6. If the problem is with a work account managed by another organization, contact that organization’s IT admin.
   • Guest or cross-organization access often keeps MFA registration tied to the old phone.
   • The admin may need to reset MFA methods so the account can be registered again on the current device.

If the goal is to get the old behavior back where both accounts work on one phone, the practical fix is to remove outdated Authenticator registrations and re-add each account on the current phone so each organization points to the same active device.

References:

• Microsoft Authenticator FAQs | Microsoft Support
• Transfer Microsoft Authenticator account entries to a new phone
• Use a screen reader to set up and troubleshoot multifactor authentication | Microsoft Support
• Troubleshoot problems with Microsoft Authenticator | Microsoft Support
• I change my phone and have issues with auhtenticator - Microsoft Q&A