Why Is My Authenticator App Not Opening? 7 Fixes to Try

If you tap the icon on your home screen and nothing happens, or the app opens for a split second and then crashes back to your home screen, you are dealing with one of the most common — and most stressful — mobile problems today. Many people ask why is my authenticator app not opening exactly when they need it most: during a login, a bank transfer, or a work sign-in that requires a one-time code. The timing makes the issue feel more urgent than a typical app glitch, because a broken authenticator app can temporarily lock you out of email, banking, cloud storage, and other accounts protected by two-factor authentication.

The good news is that this problem is rarely permanent, and it is almost never caused by something wrong with your actual accounts. In the vast majority of cases, the cause is local to your phone: a corrupted cache, an outdated app version, an operating system conflict, or a storage issue. Understanding the root cause is the first step toward a fast, reliable fix, and that is exactly what this guide walks you through.

Quick Answer: If your authenticator app is crashing, freezing, or refusing to open, try these fast fixes in order:

1. Force Close & Reopen: Close the app completely from your recent apps switcher and launch it again.

2. Restart Your Phone: Reboot your device to clear temporary system glitches.

3. Clear App Cache (Android): Go to Settings > Apps > Authenticator > Storage and tap Clear Cache (Do not select Clear Data, or you may lose your accounts).

4. Update the App & OS: Check the App Store or Google Play Store for pending updates for both the app and your phone’s operating system.

5. Check Storage Space: Ensure your phone isn’t running out of storage, which can cause apps to crash on launch.

6. Reinstall as a Last Resort: Uninstall and reinstall the app only if you have a backup enabled or access to alternative 2FA recovery options.

Why Is My Authenticator App Not Opening?

An authenticator app can fail to open for several common reasons:

• The app has temporarily frozen.
• The installed version is outdated.
• Your Android or iOS version has a compatibility issue.
• Temporary app files are corrupted.
• Your phone is running very low on storage.
• An app update did not install correctly.
• Another device-level issue is causing the app to crash.

Google’s Android troubleshooting guidance recommends restarting, updating the app and operating system, checking storage, and clearing cache when an installed app crashes or refuses to open.

Apple recommends a similar sequence for iPhone and iPad: close and reopen the app, restart the device, check for updates, and only then consider deleting and reinstalling the app.

The important difference with an authenticator app is that reinstalling can affect locally stored authentication data, so troubleshooting should start with non-destructive steps.

Fix 1: Force Close and Reopen the Authenticator App

Start by fully closing the app rather than repeatedly tapping its icon.

On Android

Open your recent apps screen and swipe the authenticator away.

If it remains unresponsive, you can usually go to:

Settings → Apps → [Authenticator App] → Force stop

Then try opening it again.

Menu names vary between Android manufacturers.

On iPhone

Open the App Switcher and swipe up on the authenticator app to close it.

Then reopen the app normally.

Apple specifically recommends closing and reopening an app when it is unresponsive, closes unexpectedly, or will not open.

If the app still crashes, continue to the next step.

Fix 2: Restart Your Phone

Restarting the phone is one of the safest troubleshooting steps because it does not remove your authenticator accounts.

A restart can clear temporary system processes or memory problems that may prevent the app from launching correctly.

After restarting:

1. Unlock the phone normally.
2. Wait for the device to finish loading.
3. Open the authenticator app before opening several other apps.

If it launches normally after the restart, no further changes are needed.

Fix 3: Update the Authenticator App

An outdated app can stop working correctly after an Android or iOS update.

Open the official app store:

Android: Google Play Store
iPhone: App Store

Search for your authenticator app and check whether an Update button appears.

Install the latest available version and test the app again.

This is especially important for security apps because compatibility and security fixes are released through app updates.

For example, Microsoft currently advises users to keep Microsoft Authenticator updated and states that versions more than 12 months old are no longer supported.

Always update from the official app store or the authenticator developer’s verified distribution channel.

Fix 4: Update Android or iOS

If the authenticator is already updated but still will not open, check your phone’s operating system.

Android

Typically:

Settings → System → Software update

The exact path varies by manufacturer.

iPhone

Go to:

Settings → General → Software Update

Install available updates, restart the phone if required, and test the authenticator again.

Google and Apple both recommend checking operating-system updates when an app repeatedly crashes or fails to open.

Fix 5: Check Available Storage

Low storage can cause apps and the operating system to behave unpredictably.

On Android, Google notes that phones can begin experiencing problems when less than about 10% of storage is available.

Check your storage and remove unnecessary files if the device is nearly full.

Good candidates include:

• Old downloads
• Large videos
• Duplicate media
• Apps you no longer use
• Offline media from streaming apps

After freeing some space, restart the phone and try opening the authenticator again.

You do not need to delete the authenticator itself just to free storage.

Fix 6: Clear Cache on Android — But Do Not Clear App Data Yet

If you use Android, corrupted temporary files can sometimes prevent an app from launching.

You can usually go to:

Settings → Apps → [Authenticator App] → Storage → Clear cache

Clearing the cache removes temporary files.

Google distinguishes this from Clear storage / Clear data, which can erase data stored by the app.

That distinction is particularly important for authenticator apps.

Avoid “Clear Data” or “Clear Storage” unless you have confirmed a backup

Do not press:

• Clear data
• Clear storage
• Reset app data

simply because the app will not open.

Depending on the authenticator, locally stored authentication entries may be removed.

Try Clear cache only first.

On iPhone, there is no universal equivalent to Android’s Clear Cache button for every app, so continue with the update and restart steps instead.

Fix 7: Reinstall the Authenticator Only as a Last Resort

If the app still refuses to open after all previous fixes, reinstalling may fix damaged application files.

However, this is the highest-risk step in this guide.

Before uninstalling, confirm that you have at least one safe way to recover your authentication accounts.

Depending on your authenticator and the services you use, that might include:

• Authenticator cloud sync
• An encrypted backup
• Exported accounts
• Recovery codes
• Another registered authentication device
• Another sign-in method

If you cannot confirm a recovery method, do not uninstall the authenticator yet.

Both Google and Apple warn that uninstalling an app can remove data stored by that app.

If your accounts are safely backed up:

1. Uninstall the authenticator.
2. Restart your phone.
3. Reinstall it from the official app store.
4. Restore or sync your accounts.
5. Test an important login before assuming the recovery succeeded.

🗺️ Browse How-To Guides: TOTP Authenticator App Guide 2026: How to Use & Compare the Best Options

What If the Authenticator Opens but the Codes Do Not Work?

That is a different problem.

If the app opens normally but:

• No code appears
• A code is rejected
• The code keeps expiring
• Push approval does not arrive
• The wrong account appears

then the issue is no longer “authenticator app not opening.”

It belongs to authenticator-code troubleshooting instead.

For example, rejected TOTP codes can be related to incorrect device time, while missing push approvals can involve connectivity or notification settings.

Keep those issues separate so you do not make unnecessary changes to an authenticator app that is actually opening correctly.

💡 Discover Helpful Guides: Authenticator App Code: How to Get Verification Codes and Fix Common Problems

What to Do If You’re Already Locked Out of Your Accounts

If you need access to an account right now and can’t wait for a fix, most major services offer alternative recovery paths:

1. Use backup codes: Most platforms (Google, Microsoft, Amazon, etc.) provide one-time backup codes when you first enable two-factor authentication.
2. Try an alternate device: If you’ve set up the same authenticator account on a tablet or a second phone, use that device to generate a code.
3. Contact account support: Most major platforms have an identity verification process for users who have lost access to their two-factor method.
4. Use SMS or email verification, if you had it set up as a backup option before switching to app-based authentication.

Recovery processes vary by platform, so it’s worth checking the specific account’s help center for the exact steps, since banking apps in particular often require additional identity verification for security reasons.

Frequently Asked Questions

Why does my authenticator app open and immediately close?

The app may be crashing because of a temporary software issue, an outdated app version, low storage, corrupted temporary files, or an operating-system compatibility problem.

Start by restarting the phone and updating both the authenticator and the operating system.

Why is Microsoft Authenticator not opening?

Start by updating Microsoft Authenticator and your phone, then restart the device.

Microsoft recommends keeping Authenticator updated and checking device settings when the app is not functioning correctly.

If it is a work or school account and the problem continues, contact your organization’s IT administrator.

Why is Google Authenticator not opening?

Treat it first as an app-launch problem:

1. Force close the app.
2. Restart the phone.
3. Update Google Authenticator.
4. Update Android or iOS.
5. Check storage.
6. On Android, clear cache.

Avoid clearing app data or uninstalling until you know how your authentication accounts will be restored.

Will restarting my phone delete authenticator codes?

No. A normal device restart does not normally delete your authenticator accounts.

That is why restarting is one of the safest first troubleshooting steps.

Will clearing cache delete my authenticator accounts?

On Android, Clear cache normally removes temporary files rather than the app’s stored user data.

Do not confuse this with Clear data or Clear storage, which can remove app data.

Will reinstalling my authenticator delete my codes?

It can.

Whether accounts return automatically depends on the authenticator’s backup or synchronization system and whether you enabled it before uninstalling.

Confirm recovery first.

What should I do if none of these fixes work?

If the app still will not launch after updating the app and OS, restarting the device, checking storage, and trying safe cache troubleshooting, contact the app developer.

For a workplace authenticator managed by your organization, contact your IT administrator instead.

🗺️ Browse How-To Guides: Authenticator App New Phone: How to Transfer It the Right Way

Conclusion

If your authenticator app is not opening, keep the troubleshooting focused on the app-launch problem.

Try the fixes in this order:

Force close → Restart phone → Update app → Update OS → Free storage → Clear cache on Android → Reinstall only after confirming backup.

Most importantly, do not turn a simple app crash into an account-access problem by clearing app data or uninstalling the authenticator too early.