A knowledge base article about Which web browsers can I use for 2-Step? provided by the UC Berkeley IT Service Hub - Knowledge Portal
If you are using a phone or tablet, or a YubiKey as an HOTP token, you can do the 2-Step using any browser. If you are using a YubiKey as a U2F token, Google Chrome and Firefox are the only compatible browsers. Note: If you find you’re unable to use 2-Step on a particular browser, make sure you do not have content restrictions, AdBlock, or child locks on the browser. If you are still unable to use 2-Step, contact calnet2-stephelp@berkeley.edu.