From the main menu on the left, select Account > Account settings.
Click Profile > Contact info.
You will see the Secondary email, you can update the email address by clicking on it.
Click Save.
Cause
The secondary email address is used to send important notifications about the Google Workspace account to the admin. For this reason it is important that this email address is external to your domain in case you have any issues with the domain or account.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-07-25 UTC."],[],[]]