What to do after an update to the CU Key mobile app or re-installation on a new device

In the event of a major update or if you are re-installing the CU Key app on a new device, it will not be possible to use the app for authentication, even though it is set as the second authentication factor, as it will not be active. Instead, you will have to use other verification method, e.g. Text message code.

1. Open the CU Key mobile app on your phone and log in.

2. Select "Other verification methods" and use either Security key (if active) or Verification via SMS message.

   

3. 

4. Once you fill in the code and confirm login, the app will ask you if you wish to activate biometrics verification; see CU Key Activation procedure.

What to do if your mobile phone is lost or stolen

1. Ask your mobile service provider to block your SIM card as soon as possible.

2. Request new SIM card with the same phone number.

3. Visit website www.ldap.cuni.cz/mfa and log into CAS. Select "Other method of verification" and use Text message code for verification.

4. Remove CU Key mobile app from active methods of two-factor authentication. It will prevent unauthorized access to your user account from the lost mobile phone.

   • Click on the arrow next to the "Mobile phone application" verification method:

     

   • Click on "Remove all" next to the CU Key app:

     

5. Install the CU Key mobile app on your new device and continue with CU Key activation procedure.

If it is not possible to retrieve your previous phone number from the service provider, you will need to contact local IT support. They have the authority to request temporary deactivation of Two-factor authentication.

What to do if your hardware key is lost or stolen

1. Inform your local IT support about the loss of your hardware key as soon as possible.

2. Visit website www.ldap.cuni.cz/mfa and log into CAS. Select any other active method of two-factor authentication (CU Key mobile app or Text message code).

3. Remove the hardware key as an active means of two- factor authentication so that your lost device cannot be used for unauthorized access.

   • Click on the arrow next to the "Security key" verification method:

     

   • Click on "Remove all" on the bottom-right corner: