A knowledge base article about Duo Verified Push: Why am I seeing a 4-digit code? provided by the UC Berkeley IT Service Hub - Knowledge Portal
If a 4-digit code appears on your Duo authentication screen, you are being prompted to complete a Verified Duo Push!
This feature is being added for employees and affiliates in order to improve campus security.
For more information on the Duo Verified Push, please visit the 2-step page of the CalNet website.