CAEN Knowledge Base
CAEN Knowledge Base

Is there a limit to the number of devices or methods in which I can enroll in Duo?

No. With Duo Two-Factor Authentication at U-M, you can enroll any number of devices, and use multiple methods of contact for mobile devices. Options include:

  • SMS text a passcode to a mobile phone
  • Automated phone call to a mobile phone or landline
  • Duo push app on any iOS or Android device
  • Obtain a hardware token

Registering multiple devices is especially helpful as a backup, as it is not uncommon to be without your smartphone when you need to log in. You can enroll as many phone numbers or devices as you want as backups, including landlines and tablets you could use as an alternative until you have your primary device.

If you only have one device enrolled in Duo and it is not available to you when attempting to log in, you can contact the ITS Service Center to get a two-factor bypass code to use for the day.