Microsoft Authenticator stops working for several reasons: wrong date/time settings, blocked notifications, outdated app versions, corrupted cache, or account registration issues after a phone switch. This guide walks you through every fix in order, from the quickest checks to a full reinstall, so you can get back into your accounts fast.
Fix 1: Force Close and Reopen the App
A stuck background process often causes Authenticator to stop generating codes or receiving push notifications. Force-closing the app clears that process.
On iPhone:
- Swipe up from the bottom of the screen (or double-press the Home button) to open the app switcher.
- Find the Microsoft Authenticator card.
- Swipe it up to close it completely.
- Wait 10 seconds, then reopen the app from your home screen.
On Android:
- Open Settings and go to Apps (or Apps & notifications).
- Find and tap Microsoft Authenticator.
- Tap Force Stop and confirm.
- Reopen the app and test whether notifications and codes are working.
Fix 2: Correct Your Device Date and Time
Time-based verification codes rely entirely on your device clock. If your phone’s time is off by even a small margin, the codes it generates will not match what Microsoft’s servers expect. This is one of the most common causes of Authenticator failures.
- Open your phone’s Settings.
- Go to General > Date & Time (iPhone) or System > Date & Time (Android).
- Turn on Set Automatically (or Automatic date & time on Android).
- If it was already on, toggle it off, wait five seconds, then toggle it back on to force a time sync.
After the time corrects, open Authenticator and generate a new code. In most cases, the problem resolves immediately.
Fix 3: Enable Notifications for Authenticator
If you are not receiving push notification approvals, your phone may be blocking Authenticator notifications. This setting is separate from the app itself.
On iPhone:
- Open Settings and tap Notifications.
- Scroll down and tap Microsoft Authenticator.
- Toggle on Allow Notifications.
- Make sure Lock Screen, Notification Center, and Banners are all enabled.
- Check that Do Not Disturb and any Focus modes are not blocking Authenticator.
On Android:
- Go to Settings > Apps > Microsoft Authenticator > Notifications.
- Enable Show notifications.
- Check battery optimization: go to Settings > Battery > Battery Optimization and set Authenticator to Don’t optimize.
Fix 4: Update the App
Running an outdated version of Microsoft Authenticator causes unexpected behavior. Microsoft regularly releases updates that fix bugs and improve compatibility with the latest security protocols.
On Android:
- Open the Google Play Store.
- Search for Microsoft Authenticator.
- Tap Update if available.
On iPhone:
- Open the App Store.
- Tap your profile icon at the top right.
- Scroll to find Microsoft Authenticator and tap Update if it appears.
After updating, open the app and confirm your accounts are still listed and generating codes.
Fix 5: Clear the App Cache (Android Only)
On Android, a corrupted app cache causes Authenticator to malfunction without deleting your registered accounts.
- Go to Settings > Apps > Microsoft Authenticator.
- Tap Storage & cache (or just Storage).
- Tap Clear Cache only. Do not tap Clear Data, as that removes your registered accounts.
- Reopen the app and test.
On iPhone, there is no direct cache-clearing option. If you need to achieve the same result, uninstall and reinstall the app (see Fix 7 below), but make sure you have a backup before doing so.
Fix 6: Restart Your Phone
Corrupt background services can cause Authenticator to crash, freeze, or fail to receive notifications. A full device restart clears these services and often resolves the issue without any other steps.
Hold the power button, restart your phone, and reopen Microsoft Authenticator after it boots up.
Fix 7: Re-register the Account in Authenticator
If a specific account’s codes are not working, removing and re-adding that account fixes corrupt registrations. This applies to both personal Microsoft accounts and work or school accounts.
- Open Microsoft Authenticator and tap the account that is not working.
- Tap the gear icon or Settings for that account.
- Select Remove account.
- On a browser, go to mysignins.microsoft.com and sign in using any available method.
- Go to Security info and tap Add sign-in method.
- Choose Authenticator app and follow the setup wizard to scan the QR code with your Authenticator app.
Note: You need access to another verification method such as a phone number or backup email to complete this process. If you are a work account user and have no alternative method, contact your IT administrator for a Temporary Access Pass (TAP).
Fix 8: Uninstall and Reinstall the App
When no other fix works, a clean reinstall resolves deeper app-level issues.
Before you uninstall, complete these steps:
- Open Authenticator and tap your profile icon to check cloud backup status.
- Confirm you have an alternative MFA method registered, such as a phone number, backup email, or security key.
- Write down which accounts are registered in the app.
Steps:
- Delete Microsoft Authenticator from your device.
- Restart your phone.
- Reinstall from the App Store or Google Play Store.
- Open the app and sign in with your Microsoft account.
- If cloud backup was on, your accounts restore automatically.
- If not, re-add each account manually using the steps in Fix 7 above.
Fix 9: Use an Alternative Sign-In Method
If Authenticator is unavailable and you need to sign in right now, Microsoft provides fallback options on the sign-in page.
- On the Microsoft sign-in page, click Sign in another way or I can’t use my Authenticator app right now.
- Choose one of the available alternatives:
- SMS code to your registered phone number
- Email verification to your backup email
- Recovery codes (if you saved them earlier)
This gets you back into your account so you can then reconfigure Authenticator properly.
What to Do If You Are Completely Locked Out
If Authenticator has stopped working and you cannot access your account through any method, follow these steps:
- Personal Microsoft accounts: Visit account.live.com/acsr to start the account recovery process. Provide as much information as possible including old passwords, linked email addresses, and billing details.
- Work or school accounts (Microsoft 365): Your IT administrator must reset MFA for your account. They can issue a Temporary Access Pass that lets you sign in without MFA so you can reconfigure Authenticator.
How to Prevent Microsoft Authenticator Not Working Again
Once you fix the immediate problem, take these steps to avoid a repeat:
- Turn on cloud backup: In Authenticator, go to Settings and enable cloud backup. This keeps your accounts recoverable if you lose your phone or need to reinstall.
- Register multiple MFA methods: Add a phone number and a backup email alongside Authenticator. Relying on a single method is what leads to lockouts.
- Keep the app updated: Enable automatic updates for Microsoft Authenticator to always have the latest bug fixes.
- Keep automatic date and time on permanently: Time drift causes verification code failures, and this one setting prevents it entirely.
Frequently Asked Questions
Why is Microsoft Authenticator showing the wrong code?
The most common cause is incorrect date and time settings on your phone. Turn on automatic time sync in your device settings. If the time is already correct, remove and re-add the account in Authenticator using Fix 7 above.
Can I use Microsoft Authenticator on two phones at once?
Yes, but you must register each device separately for each account. Adding Authenticator to a new phone does not automatically deactivate it on the old one. For best security, use one primary device and keep the other as a registered backup.
What happens if I lose my phone?
If cloud backup is on, you can restore your accounts to a new phone. If not, you need to use your backup MFA method to sign in, then set up Authenticator again on the new device. This is the exact reason you should register multiple verification methods.
Does clearing the cache delete my accounts?
No. Clearing the cache on Android only removes temporary files. Your registered accounts stay intact. However, tapping “Clear Data” instead of “Clear Cache” removes everything, so choose carefully.
Authenticator notifications work on Wi-Fi but not on mobile data. What should I do?
Check that mobile data is enabled for Microsoft Authenticator. On iPhone, go to Settings, scroll to Authenticator, and verify cellular data access is on. On Android, go to Settings > Apps > Authenticator > Data Usage and enable background data.
