Essential Contacts is the list of people Google Cloud sends important platform notifications to, such as billing and payment problems, security notices, legal and compliance notices, and warnings about suspension. You choose the email addresses and which categories of notice each address receives, at the organization, folder, or project level.
This matters because by default no Essential Contacts are configured. In that case Google falls back on whoever holds certain IAM roles. Legal notices go to billing administrators, security notices go to organization administrators, and suspension and technical notices go to project owners. If that person has changed roles, left the company, or never reads those emails, a warning that a project is about to be suspended can go unseen. Essential Contacts lets you point each kind of notice at a mailbox someone actually watches.
This walks through adding a contact in the console, then covers what each notification category means, where to set contacts and who to use, and who is allowed to manage them.
Open the console, then the menu, then IAM and Admin, then Essential Contacts. If the page asks you to enable the Essential Contacts API, enable it. Check the resource selector at the top of the page, since it shows whether you are managing contacts for an organization, a folder, or a project.
Open Cloud Console
Open Menu > IAM & Admin > Audit Logs


Enter the email address in both the Email and Confirm Email fields, then choose the notification categories this address should receive. Click Save.

The contact appears in the list with the categories you selected.

To create, view, edit, or delete contacts, a person needs the Essential Contacts Admin role. Viewing contacts only needs the Essential Contacts Viewer role. Contacts can be changed or removed from the same page where you added them.
An organization can also limit which email domains new contacts are allowed to use, by setting the organization policy constraint named essentialcontacts.allowedContactDomains. If an address is rejected when you try to add it, a domain restriction like this is a likely reason.
That covers adding Essential Contacts, what each category sends, and who should be on the list. To go further, explore Prwatech’s Google Cloud training program, which includes placement assistance.