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How to Lock Authenticator App Duo Secure on iPhone

iOS 18 Face ID lock and Hidden folder · APPERTURE SP Z O O · checked November 2026

Time needed
4 taps
Needs iOS 18 or later

Works for Authenticator App Duo Secure whether or not it has its own passcode. No download needed.

Short answer

Touch and hold Authenticator App Duo Secure's icon, tap Require Face ID, then confirm. On iOS 18 and later that puts Authenticator App Duo Secure behind Face ID, Touch ID or your passcode; choose Hide and Require Face ID instead to move it into App Library's Hidden folder as well.

Lock Authenticator App Duo Secure with Face ID

  1. Find Authenticator App Duo Secure on your Home Screen or in App Library.
  2. Touch and hold the icon until the quick-actions menu opens.
  3. Tap Require Face ID (or Require Touch ID / Require Passcode, depending on your iPhone).
  4. Tap Require Face ID again to confirm. Authenticator App Duo Secure now asks for authentication every time it opens.

To test it, close Authenticator App Duo Secure from the App Switcher and open it again. You should see the Face ID prompt before any content appears.

Hide Authenticator App Duo Secure in App Library

  1. Touch and hold Authenticator App Duo Secure's icon and tap Require Face ID.
  2. Choose Hide and Require Face ID instead of Require Face ID.
  3. Confirm. The icon leaves your Home Screen and moves to the Hidden folder at the bottom of App Library.
  4. To open it later, swipe to App Library, tap Hidden and authenticate.

Hiding also locks the app. To undo either, touch and hold the icon again and choose Don't Require Face ID.

Why lock Authenticator App Duo Secure?

Authenticator App Duo Secure's privacy label lists location — the kind of data you would not want on screen if someone borrows your unlocked phone. Authenticator apps generate the second factor for your logins. The biggest practical risk is not data collection but losing your codes when you lose your phone.

Business apps often handle other people's data — clients, colleagues and customers — so what they collect can affect more than you.

A lock answers one question — who can open the app on this iPhone. It does not change what Authenticator App Duo Secure sends to its developer; for that, see Authenticator App Duo Secure's full privacy report.

What the lock does and does not do

It does

  • Ask for Face ID, Touch ID or passcode every time Authenticator App Duo Secure opens
  • Hide message previews in notifications
  • Keep Authenticator App Duo Secure's content out of Spotlight and Siri suggestions
  • With Hide, remove the icon from the Home Screen

It does not

  • Stop someone who knows your passcode
  • Encrypt or change how Authenticator App Duo Secure stores data
  • Sync to your iPad or other devices
  • Remove Authenticator App Duo Secure from purchase history or Screen Time reports

Don't see Require Face ID?

  • Update to iOS 18 or later in Settings › General › Software Update.
  • Make sure a passcode is set in Settings › Face ID & Passcode; the lock needs one.
  • Some Apple apps (Settings, Calculator, Camera, Maps, Find My, Clock) cannot be locked or hidden.
  • If your iPhone is managed by work or school, the option may be restricted.

Other settings worth checking for Authenticator App Duo Secure

  1. Tracking

    Settings › Privacy & Security › Tracking. If “Allow Apps to Request to Track” is off, apps cannot ask, and they are told to treat you as having declined. You can also turn it off for this app alone.

  2. Location

    Settings › Privacy & Security › Location Services › Authenticator App Duo Secure. Choose While Using or Never, and switch off Precise Location if a city-level answer is enough.

  3. Sign-in

    When creating an account, Sign in with Apple can give the app a relay address from Hide My Email instead of your real one.

  4. Notifications

    Settings › Notifications › Authenticator App Duo Secure › Show Previews: When Unlocked keeps message and account details off the Lock Screen.

Authenticator App Duo Secure's full privacy label

App Privacy label Developer-reported · checked November 1, 2026
Used to track you
1type
Linked to you
0types

None declared

Not linked to you
5types

Is Authenticator App Duo Secure safe? Every data type explained →

Lock these apps too

After you lock Authenticator App Duo Secure

Tick what you have done
Tick each step as you do it on your iPhone.

Done. You have applied every control the label points to.

FAQ

Does Authenticator App Duo Secure have its own passcode?
Some apps offer an in-app PIN or biometric lock in their settings. The App Store privacy label does not say whether Authenticator App Duo Secure does; the iOS 18 lock works regardless.
What happens to Authenticator App Duo Secure's notifications when it is locked?
Locked and hidden apps do not show message previews or content in notifications, and their content does not appear in Spotlight search or Siri suggestions.
Can someone who knows my passcode open a locked app?
Yes. If Face ID fails, the lock falls back to your device passcode. Keep the passcode private if the lock matters to you.
Is a locked Authenticator App Duo Secure encrypted?
The lock controls who can open the app on this iPhone. It does not change how the app stores or syncs data. Encryption depends on the developer and on your device passcode.
Why can't I see the Require Face ID option?
You need iOS 18 or later. Some Apple apps such as Settings, Calculator, Maps and Camera cannot be locked or hidden.
Does hiding Authenticator App Duo Secure remove it from my purchase history?
No. Hidden apps still appear in App Store purchases and in Settings › Apps, and Screen Time reports still include them.

Is Authenticator App Duo Secure safe? Full privacy report →Does Authenticator App Duo Secure track you? →Lock an app: A–Z →All business apps →

Facts on this page come from Apple: lock or hide an app on iPhone, as reported by the developer. Checked November 2026. How we collect data · Report a correction