A knowledge base article about 2-Step Single Use Passcodes provided by the UC Berkeley IT Service Hub - Knowledge Portal
You can generate single-use passcodes (sometimes called Bypass Codes) in a variety of ways to use with CalNet 2-Step. Visit the 2-Step page on the CalNet webpage for instructions.
If you are having trouble with Duo, you can open a ticket by emailing: calnet2-stephelp@berkeley.edu