MyFRITZ!Net 2FA: how to set up an authenticator app

MyFRITZ!Net is the free FRITZ! service that gives your FRITZ!Box a fixed address on the internet, so you can open the router's settings or connect by VPN while you're away. It also emails you about your box and its updates (FRITZ!). An account that reaches your home router from anywhere is worth protecting.

FRITZ! calls two-factor authentication "additional protection" here. It's optional. Besides an authenticator app, you can use a fingerprint or face scan on a phone, or a USB security key on a computer (FRITZ!). This guide covers the authenticator app, with Authenticator App - Novaz on iPhone. Other authenticator apps follow the same steps. One thing is unusual: if you lose the authenticator, the documented way back in runs through your own FRITZ!Box, not a support team.

How we checked this guide: the MyFRITZ!Net steps come from FRITZ!'s own help pages on fritz.com, linked below, which we read on October 20, 2026. We haven't tested them on a MyFRITZ! account, so a label may differ slightly. The Novaz steps are checked against the app, version 1.0.5.

Turn on 2FA with an authenticator app

These steps are from FRITZ!'s security tips for MyFRITZ!Net (FRITZ!):

1. Go to myfritz.net in a web browser. Enter the email address and MyFRITZ! password you registered with, click Log In, and solve the CAPTCHA.
2. Click the three-dot menu at the top right of the page, then Account Settings.
3. Click Additional protection.
4. In the section Configure Confirmation with One-time Password, click Configure. MyFRITZ!Net shows a QR code.
5. In Novaz, tap +, then Scan QR code, and hold the camera over the code until it's picked up.
6. Type the code Novaz shows into the Confirmation code field and click Confirm.
7. Click Save to keep the recovery key. Turn on I saved the key, then click Finished.

If you've opened myfritz.net on the iPhone that has Novaz, you can't point the camera at the screen. Take a screenshot of the QR code instead, then tap + and Choose a photo in Novaz. See scanning a QR code on the same iPhone.

FRITZ!'s instructions only describe the QR code. They don't mention a text key to type in, or how often the codes change.

Keep the recovery key somewhere else

MyFRITZ!Net gives you one recovery key at setup, not a list of backup codes. FRITZ!'s pages don't explain how to use it at sign-in, but its lockout help treats the key as your fallback when the confirmation device is gone (FRITZ!). Novaz holds its keys only on your iPhone unless you've made an iCloud backup or a backup file, so store the key in a password manager or on paper, not only on that phone. See 2FA backup codes.

A separate code for the FRITZ!Box itself

Don't mix this up with the FRITZ!Box's own authenticator setting. In the box's user interface, under System > FRITZ!Box Users, each user can get an authenticator in the section Confirmation by App (One-time Password). That code confirms sensitive changes to the router's settings, and one confirmation lasts an hour. In your home network you can confirm by pressing a button on the box instead (FRITZ!).

The setup button there is New Setup on one FRITZ! page and Configure Authenticator on another. If you set up both, Novaz holds two entries: one for the MyFRITZ! account, one for the box.

If MyFRITZ!Net rejects your code

FRITZ!'s help has no advice on rejected codes. The codes depend on the time, so check that your iPhone sets its clock itself: Settings > General > Date & Time > Set Automatically. Novaz warns you once the clock drifts by 15 seconds or more. Other reasons: Authenticator code not working?

Changing phones

FRITZ!'s pages say nothing about switching phones. With Novaz's iCloud backup or a backup file, you can restore your accounts on the new iPhone and keep the same codes (how to move to a new iPhone). Without one, keep the old phone until the new one works. If Additional protection gives you no way to swap devices, the FRITZ!Box route below removes the protection so you can set it up again with the new phone.

If you lose your authenticator

Try your recovery key first. Without it, FRITZ! documents one fix: remove the protection from a FRITZ!Box that's set up with your MyFRITZ! account (FRITZ!):

1. Open the FRITZ!Box user interface and click Internet, then MyFRITZ! Account.
2. In the section Additional Protection for Your MyFRITZ! Account, click Remove Additional Protection for MyFRITZ! Account. It can take a moment to appear.
3. Click yes, and confirm on the FRITZ!Box if it asks.

You sign in to the box's user interface with the FRITZ!Box's own password, not your MyFRITZ! one. Do this at home: there, a press of a button on the box can serve as the confirmation, so you don't need a code from your lost phone (FRITZ!). FRITZ!'s pages don't describe a route through customer support. For general steps, see Lost the phone with your authenticator app?

Turning 2FA off

The FRITZ!Box steps above are the only way to turn it off that FRITZ!'s help describes. Afterwards, open the MyFRITZ! entry in Novaz and tap Remove account.

Official FRITZ! help

• What is MyFRITZ!Net and how can I use it?
• Security tips for using MyFRITZ!Net
• Disabling additional confirmation for a MyFRITZ! account
• Extra confirmation to configure certain functions