The Holland Computing Center (HCC) is working to reduce the telephony usage for two-factor HCC authentication to help ease the use of two-factor authentication. Through the DUO service, you can receive a push notification to your smart phone or utilize a USB hardware token such as a YubiKey. We encourage you to use HCC DUO push if possible. 

If you need to reactivate HCC DUO mobile, activate HCC DUO on your smart phone, or add a YubiKey to your HCC account, please contact HCC at [email protected]