CAEN Knowledge Base
CAEN Knowledge Base

Note: For updates from the College about resources for learning, teaching and working remotely due to the COVID-19 pandemic, visit:

Enter your question or keyword below to search our knowledge base. At any time, you can click the Blue button in the bottom-right corner of the page to open a Live Chat session with a CAEN consultant. If no consultant is available, you will be prompted to submit an offline message, and the next available consultant will contact you at the email address you provide.

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.

Several options are available, including:

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

Registering multiple devices is especially helpful as a backup, in case you may 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 call or chat the ITS Service Center for a bypass code to let you in.